TOPSHOT - A woman, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, walks along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

TOPSHOT - Koi swim in a lotus pond along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

People wearing face masks as a preventive measure against the spread of the COVID-19 novel coronavirus exercise along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

People wearing face masks as a preventive measure against the spread of the COVID-19 novel coronavirus walk along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

A woman, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, walks along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

Tape is used to mark off spaces for social distancing at a seating area, as a preventive measure against the spread of the COVID-19 novel coronavirus, along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

People walk past the Merlion statue at Merlion Park in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

People wear face masks as a preventive measure against the spread of the COVID-19 novel coronavirus as they walk along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

A man wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus cycles along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

A man cycles along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

Koi swim in a lotus pond along the promenade at Marina Bay in Singapore on May 4, 2020. (Photo by Roslan RAHMAN / AFP)

Muslims wearing masks wait outside a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian)

A man wears a mask with Malaysia national flag outside a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian)

Workers unload stocks at a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian)

A poultry vendor wearing a face mask to help curb the spread of the coronavirus prepares birds at a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian), APTOPIX

A woman wearing a face mask to help stop the spread of the coronavirus shops at a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian)

A man wearing a face mask to help curb the spread of the coronavirus shops at a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian)

A poultry butcher wearing a face mask to help curb the spread of the coronavirus waits for customers at a wet market in downtown Kuala Lumpur, Malaysia, Friday, April 24, 2020. Malaysia, along with neighboring Singapore and Brunei, has banned popular Ramadan bazaars where food, drinks and clothing are sold in congested open-air markets or road-side stalls. The bazaars are a source of key income for many small traders, some who have shifted their businesses online. (AP Photo/Vincent Thian)

A resident (C), wearing a face mask as a preventive measure against the COVID-19 novel coronavirus, looks at groceries on offer from a mobile supermarket in Singapore on April 24, 2020. (Photo by Roslan RAHMAN / AFP)

A resident, wearing a face mask as a preventive measure against the COVID-19 novel coronavirus, looks at groceries on offer from a mobile supermarket in Singapore on April 24, 2020. (Photo by Roslan RAHMAN / AFP)

An employee (L), wearing a face mask as a preventive measure against the COVID-19 novel coronavirus, checks on groceries available from a mobile supermarket in Singapore on April 24, 2020. (Photo by Roslan RAHMAN / AFP)

An employee (2nd L), wearing a face mask as a preventive measure against the COVID-19 novel coronavirus, packs groceries from a mobile supermarket for a resident in Singapore on April 24, 2020. (Photo by Roslan RAHMAN / AFP)

A car drives along an otherwise empty road in the financial district of Singapore on April 24, 2020, as the country undergoes a partial lockdown to fight the spread of the COVID-19 novel coronavirus. (Photo by Roslan RAHMAN / AFP)

A car drives along an otherwise empty road in the financial district of Singapore on April 24, 2020, as the country undergoes a partial lockdown to fight the spread of the COVID-19 novel coronavirus. (Photo by Roslan RAHMAN / AFP)

A man, wearing a face mask as a preventive measure against the COVID-19 novel coronavirus, hangs groceries off his mobility scooter as he rides along a road in Singapore on April 24, 2020. (Photo by Roslan RAHMAN / AFP)

People walk out from a shop in Hanoi, Vietnam Thursday, April 23, 2020. The world inched toward a new phase in the coronavirus crisis on Thursday, as some countries like Vietnam and New Zealand with few new cases moved toward ending their shutdowns while others like Singapore and Japan were tightening measures to prevent a surge in infections. (AP Photo/Hau Dinh)

In this photo provided by the Singapore Ministry of Foreign Affairs, Singaporean Foreign Minister Vivian Balakrishnan, center, speaks from Singapore during a videoconference on COVID-19 between ASEAN Foreign Ministers and U.S. Secretary of State Mike Pompeo Thursday, April 23, 2020. (Singapore Ministry of Foreign Affairs via AP)

A Muslim woman, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, receives instructions from a social distancing ambassador at the Geylang Serai wet market in Singapore on April 23, 2020, ahead of the start of the holy Muslim month of Ramadan. (Photo by Roslan RAHMAN / AFP)

A man, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, makes a purchase at a fish stall in Geylang Serai wet market in Singapore on April 23, 2020, ahead of the start of the holy Muslim month of Ramadan. (Photo by Roslan RAHMAN / AFP)

A Muslim woman, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, walks past decorations for the holy Muslim month of Ramadan in the Geylang Serai district of Singapore on April 23, 2020. (Photo by Roslan RAHMAN / AFP)

A man, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, walks past decorations for the holy Muslim month of Ramadan in the Geylang Serai district of Singapore on April 23, 2020. (Photo by Roslan RAHMAN / AFP)

A Muslim woman, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, pushes a trolley full of groceries outside the Geylang Serai wet market in Singapore on April 23, 2020, ahead of the start of the holy Muslim month of Ramadan. (Photo by Roslan RAHMAN / AFP)

In this Wednesday, April 22, 2020, photo, rooms at ibis style's hotel in Vung Tau, Vietnam, are lit up, forming a heart shape to support the country unity in the fight against COVID-19. The world inched toward a new phase in the coronavirus crisis on Thursday, as some countries like Vietnam and New Zealand with few new cases moved toward ending their shutdowns while others like Singapore and Japan were tightening measures to prevent a surge in infections. (AP Photo/Thanh Tu)

A food vendor wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus prepares food at a hawker centre in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

People wearing facemasks as a prevention measure against the spread of the COVID-19 coronavirus shop at a busy wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

People wearing facemasks as a prevention measure against the spread of the COVID-19 coronavirus queue to buy takeaway food next to empty tables at a hawker centre in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

People wearing facemasks as a prevention measure against the spread of the COVID-19 coronavirus queue to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

People wearing facemasks as a prevention measure against the spread of the COVID-19 coronavirus show their identitification card as they queue to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

A woman wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus pulls a trolley in a queue to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

People wearing facemask as a prevention measure against the spread of the COVID-19 coronavirus keep their distance in a queue to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

An information notice on prevention measures against the spread of the COVID-19 coronavirus including advising people to wear facemask or else being prohibited from entering a wet market is pictured in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

Instruction notice placards hang on a barrier as a man wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus queues to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

A town council employee wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus puts up an instruction notice on who can enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

A woman wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus walks past a banner encouraging safe distancing at a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

A woman wearing a facemask as a prevention against the spread of the COVID-19 coronavirus walks past a cordoned off playground in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

A woman with an injured leg and wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus queues to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

A woman (R) wearing a facemask as a prevention measure against the spread of the COVID-19 coronavirus is given direction by safe distancing ambassadors as others (L) queue to enter a wet market in Singapore on April 22, 2020. (Photo by ROSLAN RAHMAN / AFP)

Migrant workers are seen resting on the staircase and balcony after lunch time at the dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 22, 2020. (Photo by Roslan RAHMAN / AFP)

Migrant workers are seen resting at balcony after lunch time at the dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 22, 2020. (Photo by Roslan RAHMAN / AFP)

Migrant workers are seen resting on the staircase and balcony after lunch time at the dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 22, 2020. (Photo by Roslan RAHMAN / AFP)

A migrant worker rest on the staircase after lunch break at the dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 22, 2020. (Photo by Roslan RAHMAN / AFP)

A woman looks at an image of silhouettes of the "Virus Vanguard" superhero campaign to fight the COVID-19 coronavirus outbreak that was launched then shelved by Singapore authorities on a government Facebook page in Singapore on April 21, 2020. - A band of Singapore superheroes created to help in the coronavirus fight has been shelved after internet users criticised the campaign for being too light-hearted and for mocking Liverpool football club. On April 20 the government announced on its Facebook page the campaign was under review, while a picture of the characters disappeared and was replaced by their silhouettes. (Photo by ROSLAN RAHMAN / AFP)

Men are seen gathering along the balcony at the S11 Punggol dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 21, 2020. (Photo by ROSLAN RAHMAN / AFP)

Men are seen along balconies at S11 Punggol dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 21, 2020. (Photo by ROSLAN RAHMAN / AFP)

Men are seen wearing face masks walking around the compound of S11 Punggol dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 21, 2020. (Photo by ROSLAN RAHMAN / AFP)

Men are seen wearing face masks walking around the compound and balcony of S11 Punggol dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 21, 2020. (Photo by ROSLAN RAHMAN / AFP)

A Police Coast Guard boat patrols along the Johor Strait next to the S11 Punggol dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 21, 2020. (Photo by ROSLAN RAHMAN / AFP)

A partial view of the S11 Punggol dormitories that houses foreign workers and has been made into an isolation area to prevent the spread of the COVID-19 coronavirus in Singapore on April 21, 2020. (Photo by ROSLAN RAHMAN / AFP)

A stallholder wears a face mask as he cleans his stall at a hawker centre, where the seats have been cordoned off as a preventive measure against the spread of the COVID-19 novel coronavirus, in Chinatown in Singapore on April 21, 2020. - Singapore extended restrictions to fight the coronavirus until early June, the city-state's leader said on April 21, as cases surged past 9,000 due to a growing number of infections among migrant workers. (Photo by Catherine LAI / AFP)

Seats are seen cordoned off as a preventive measure against the spread of the COVID-19 novel coronavirus in Chinatown in Singapore on April 21, 2020. - Singapore extended restrictions to fight the coronavirus until early June, the city-state's leader said on April 21, as cases surged past 9,000 due to a growing number of infections among migrant workers. (Photo by Catherine LAI / AFP)

A man wears a face mask as he walks through a hawker centre, where the seats have been cordoned off as a preventive measure against the spread of the COVID-19 novel coronavirus, in Chinatown in Singapore on April 21, 2020. - Singapore extended restrictions to fight the coronavirus until early June, the city-state's leader said on April 21, as cases surged past 9,000 due to a growing number of infections among migrant workers. (Photo by Catherine LAI / AFP)

Stallholders wearing face masks wait for customers to order takeaway meals at a hawker centre, where the seats have been cordoned off as a preventive measure against the spread of the COVID-19 novel coronavirus, in Chinatown in Singapore on April 21, 2020. - Singapore extended restrictions to fight the coronavirus until early June, the city-state's leader said on April 21, as cases surged past 9,000 due to a growing number of infections among migrant workers. (Photo by Catherine LAI / AFP)

A woman wearing a face mask pushes a trolly in a hawker centre, where the seats have been cordoned off as a preventive measure against the spread of the COVID-19 novel coronavirus, in Chinatown in Singapore on April 21, 2020. - Singapore extended restrictions to fight the coronavirus until early June, the city-state's leader said on April 21, as cases surged past 9,000 due to a growing number of infections among migrant workers. (Photo by Catherine LAI / AFP)

A man wears a face masks as he walks past closed stalls at a hawker centre, where the seats have been cordoned off as a preventive measure against the spread of the COVID-19 novel coronavirus, in Chinatown in Singapore on April 21, 2020. - Singapore extended restrictions to fight the coronavirus until early June, the city-state's leader said on April 21, as cases surged past 9,000 due to a growing number of infections among migrant workers. (Photo by Catherine LAI / AFP)

People walk along the balconies of the S11@Punggol complex, a dormitory building for migrant workers in Singapore on Monday, April 20, 2020. Singapore announced their biggest single-day spike in new coronavirus cases on Monday, as the crisis intensifies in parts of Asia. The city state reported a record 1,426 new coronavirus cases on Monday, mostly among foreign workers. The S11 Dormitory@Punggol is one of two foreign worker dormitories that have been announced as isolation areas, which means that foreign workers who stay there are under quarantine. (AP Photo/YK Chan)

A Singapore Mass Rapid Transit train is pictured next to a deserted construction sites in Singapore on April 20, 2020, as authorities shuttered work sites as a preventive measure against the spread of the COVID-19 coronavirus. - Singapore has ordered all workers in the construction industry to stay at home for 14-days from April 20 to prevent further transmission of the deadly coronavirus disease at work sites. (Photo by ROSLAN RAHMAN / AFP)

A general view of a deserted construction sites in Singapore on April 20, 2020, as authorities shuttered work sites as a preventive measure against the spread of the COVID-19 coronavirus. - Singapore has ordered all workers in the construction industry to stay at home for 14-days from April 20 to prevent further transmission of the deadly coronavirus disease at work sites. (Photo by ROSLAN RAHMAN / AFP)

A man jogs along the pavement next to a deserted construction site in Singapore on April 20, 2020, as authorities shuttered work sites as a preventive measure against the spread of the COVID-19 coronavirus. - Singapore has ordered all workers in the construction industry to stay at home for 14-days from April 20 to prevent further transmission of the deadly coronavirus disease at work sites. (Photo by ROSLAN RAHMAN / AFP)

A deserted construction site is pictured in Singapore on April 20, 2020, as authorities shuttered work sites as a preventive measure against the spread of the COVID-19 coronavirus. - Singapore has ordered all workers in the construction industry to stay at home for 14-days from April 20 to prevent further transmission of the deadly coronavirus disease at work sites. (Photo by ROSLAN RAHMAN / AFP)

A view of a deserted construction site in Singapore on April 20, 2020, as authorities shuttered work sites as a preventive measure against the spread of the COVID-19 coronavirus. - Singapore has ordered all workers in the construction industry to stay at home for 14-days from April 20 to prevent further transmission of the deadly coronavirus disease at work sites. (Photo by ROSLAN RAHMAN / AFP)

Grab delivery cyclists ride past eact other in Singapore on April 20, 2020, as the number of food deliveries has surged since stay at home restrictions were put in place to halt the spread of the COVID-19 coronavirus. (Photo by ROSLAN RAHMAN / AFP)

A Grab delivery cyclist rides across a junction in Singapore on April 20, 2020, as the number of food deliveries has surged since stay at home restrictions were put in place to halt the spread of the COVID-19 coronavirus. (Photo by ROSLAN RAHMAN / AFP)

A man, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, walks along a footpath in Singapore on April 20, 2020. (Photo by Roslan RAHMAN / AFP)

A woman, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, cycles with a child in the front of the bicycle along a footpath in Singapore on April 20, 2020. (Photo by Roslan RAHMAN / AFP)

A team of migrant workers from India trim the trees along Holland Road in Singapore on Sunday, Apr. 19, 2020. The number of new coronavirus cases in the city state has more than doubled over the past week amid an explosion of infections in crowded dormitories for foreign workers, which now makes up around 60% of Singapore's cases. (AP Photo/YK Chan)

A migrant worker from India trims the trees along Holland Road in Singapore on Sunday, Apr. 19, 2020. The number of new coronavirus cases in the city state has more than doubled over the past week amid an explosion of infections in crowded dormitories for foreign workers, which now makes up around 60% of Singapore's cases. (AP Photo/YK Chan)

A migrant worker from India trim the trees along Holland Road in Singapore on Sunday, April 19, 2020. The number of new coronavirus cases in the city state has more than doubled over the past week amid an explosion of infections in crowded dormitories for foreign workers, which now makes up around 60% of Singapore's cases. (AP Photo/YK Chan)

Residents queue for their food at Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

Residents queue for their food at Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

Residents queue for their food at Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

Residents stand along a corridor of Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

Residents queue for their food at Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

A man stands along a corridor of Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

A man, wearing a face mask walks outside Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

A general view shows the Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

A general view shows the Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

Residents stand along corridors of Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

A man, wearing a face mask walks along corridor of Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by Roslan RAHMAN / AFP)

A man stands on the doorway at Tuas South foreign workers dormitory that has been placed under government restriction as preventive measure against the spread of the COVID-19 coronavirus in Singapore on April 19, 2020. - Singapore imposed a mandatory stay-home order for migrant workers including in the construction sector for 14 days effective on April 20 due to coronavirus pandemic. (Photo by ROSLAN RAHMAN / AFP)

A digital board displays advisory to motorists to "Stay Home, Stay Safe and Singapore United" as a campaign to halt the spread of the COVID-19 coronavirus along the expressway in Singapore on April 19, 2020. (Photo by Roslan RAHMAN / AFP)

A safe-distancing enforcement officer wearing a red armband watches over customers lining up to buy take-away food at a food court in Singapore on Saturday, April 18, 2020. The officers have been deployed throughout the Southeast Asian city-state to ensure people maintain distance from one another as it grapples with a spike in coronavirus cases. (AP Photo/YK Chan)

A safe-distancing enforcement officer wearing a red armband checks his phone at a food court in Singapore on Saturday, April 18, 2020. The officers have been deployed throughout the Southeast Asian city-state to ensure people maintain distance from one another as it grapples with a spike in coronavirus cases. (AP Photo/YK Chan)

Christabel Chai of Singapore unfurls the flag of her homeland as she is honored with other foreign-born cadets during the graduation ceremony for the class of 2020 at the U.S. Air Force Academy in Colorado on Saturday, April 18, 2020. (AP Photo/David Zalubowski)

A couple wearing face masks as a preventive measure against the spread of the COVID-19 coronavirus walk with their dog along the neighbourhood park in Singapore on April 18, 2020. (Photo by Roslan RAHMAN / AFP)

A couple wearing face maskS as a preventive measure against the spread of the COVID-19 coronavirus walk along the neighbourhood park in Singapore on April 18, 2020. (Photo by Roslan RAHMAN / AFP)

The S11@Punggol foreign worker's dormitory compound can be seen Friday, April 17, 2020, in Singapore. The city state is the latest Southeast Asian nation to surpass 5,000 COVID-19 cases, after more than 600 new cases were reported Friday. The health ministry said most of the new cases are foreign workers living in crowded dormitories. (AP Photo/YK Chan)

Vehicles pass the S11@Punggol foreign worker's dormitory compound, Friday, April 17, 2020 in Singapore. The city state is the latest Southeast Asian nation to surpass 5,000 COVID-19 cases, after more than 600 new cases were reported Friday. The health ministry said most of the new cases are foreign workers living in crowded dormitories. (AP Photo/YK Chan)

A man, wearing a face mask as a preventive measure against the spread of the COVID-19 novel coronavirus, walks past a neighbourhood park that has been cordoned off in Singapore on April 16, 2020. (Photo by Roslan RAHMAN / AFP)

A man looks out from a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

Men sit on the outdoor steps of a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

Men look out from the balcony of a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

Men give a thumbs up sign from the balcony of a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

Workers wearing face masks, as a preventive measure against the spread of the COVID-19 coronavirus, wait for transport to their job sites in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

Men look out from a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

A man looks on from the balcony of a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

Men are pictured at a dormitory used by foreign workers at Cochrane Lodge 2, which has been made an isolation area to prevent the spread of the COVID-19 coronavirus, in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

A man wearing a face mask, as a preventive measure against the spread of the COVID-19 coronavirus, and a tag that reads "Safety starts with me,| takes a nap while waiting for transport to work in Singapore on April 15, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by ROSLAN RAHMAN / AFP)

A runner wears a face-mask jogging in Marina Bay in Singapore on 15 April 2020. As of April 14th it is now mandatory to wear a face mask when outside the house except during strenuous exercise or for babies under two years old. First time offenders will be fined SGD300 and repeat offenders are liable for higher fines or prosecution. The new regulation was introduced to help combat the COVID-19 novel coronavirus. (Photo by Haruhiko Otsuka/AFLO)

All passengers wear face masks on the MRT North East Line in Singapore on 15th April 2020. Singapore introduced new legislation stipulating that everyone must wear a face mask when outside their house except during strenuous exercise or for infants under 2 years of age. First time offenders will be fined SGD300 and repeat offenders can receive higher fines or be prosecution as a measure against the COVID-19 novel coronavirus. (Photo by Haruhiko Otsuka/AFLO)

A man wearing a mask as a preventive measure against the spread of the COVID-19 coronavirus pushes a trolley in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A man wearing a face mask as a preventive measure against the spread of the COVID-19 coronavirus walks next to commercial buildings in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A man wearing a face mask as a preventive measure against the spread of the COVID-19 coronavirus walks in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

Women wearing face masks as a preventive measure against the spread of the COVID-19 coronavirus do some light exercises in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

Workers wearing face masks as a preventive measure against the spread of the COVID-19 coronavirus take a break on the grass in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A notice advises on safe distancing measures as a preventive measure against the spread of the COVID-19 coronavirus in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A worker wearing a face mask as a preventive measure against the spread of the COVID-19 coronavirus clears leaves next to a bronze statue in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

People wearing face masks as a preventive measure against the spread of the COVID-19 coronavirus walk pass commercial buildings in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A man wearing face mask as a preventive measure against the spread of the COVID-19 coronavirus walks next to closed restaurants at Boat Quay next to the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A man wearing face mask as a preventive measure against the spread of the COVID-19 coronavirus waits outside a McDonald's fast food outlet at Boat Quay next to the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

A woman sits alone in a public space that is empty as people stay home to try to halt the spread of the COVID-19 coronavirus in the Raffles Place financial business district in Singapore on April 14, 2020. (Photo by ROSLAN RAHMAN / AFP)

Foreign workers are seen in a dormitory at Cochrane Lodge 2, which has been gazetted as an isolation area to prevent the spread of the COVID-19 novel coronavirus, in Singapore on April 14, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by Roslan RAHMAN / AFP)

Foreign workers are seen in a dormitory at Cochrane Lodge 2, which has been gazetted as an isolation area to prevent the spread of the COVID-19 novel coronavirus, in Singapore on April 14, 2020. - Singapore won praise for keeping its outbreak in check in the early stages of the fight against the COVID-19 novel coronavirus but has seen a surge in cases this month, with many linked to foreign workers' dormitories. (Photo by Roslan RAHMAN / AFP)

A notice at the entrance to a Seven Eleven store in Singapore on 12 April 2020 states that it is mandatory for all customers to wear a mask before entering the store. Singapore is tightening new circuit breaker measures against the COVID-19 novel coronavirus and will start to introduce on the spot fines for people disobeying guidelines.

A notice at the entrance to a Seven Eleven store in Singapore on 12 April 2020 states that it is mandatory for all customers to wear a mask before entering the store. Singapore is tightening new circuit breaker measures against the COVID-19 novel coronavirus and will start to introduce on the spot fines for people disobeying guidelines.

The gate to the WestLite Toh Guan dormitory is closed after it was declared an isolation area under the Infectious Diseases Act, following a spike in the number of COVID-19 cases in several foreign worker dormitories in Singapore, Friday, April 10, 2020. The tiny city-state of Singapore, with under six million people, has been hailed as a model in its swift response to the virus in the early days. But it overlooked the massive pool of migrant workers living in close quarters where social distancing is impossible and conditions are ripe for the virus spread. (AP Photo)

A security officer patrols the perimeter of the WestLite Toh Guan dormitory after it was declared an isolation area under the Infectious Diseases Act, following a spike in the number of COVID-19 cases in several foreign worker dormitories in Singapore, Friday, April 10, 2020. The tiny city-state of Singapore, with under six million people, has been hailed as a model in its swift response to the virus in the early days. But it overlooked the massive pool of migrant workers living in close quarters where social distancing is impossible and conditions are ripe for the virus spread. (AP Photo)

A security officer guards a gantry entrance to the WestLite Toh Guan dormitory after it was declared an isolation area under the Infectious Diseases Act, following a spike in the number of COVID-19 cases in several foreign worker dormitories in Singapore, Friday, April 10, 2020. The tiny city-state of Singapore, with under six million people, has been hailed as a model in its swift response to the virus in the early days. But it overlooked the massive pool of migrant workers living in close quarters where social distancing is impossible and conditions are ripe for the virus spread. (AP Photo/Yong Teck Lim)

A foreign worker talks on the phone outside his room at the WestLite Toh Guan dormitory after it was declared an isolation area under the Infectious Diseases Act, following a spike in the number of COVID-19 cases in several foreign worker dormitories in Singapore, Friday, April 10, 2020. The tiny city-state of Singapore, with under six million people, has been hailed as a model in its swift response to the virus in the early days. But it overlooked the massive pool of migrant workers living in close quarters where social distancing is impossible and conditions are ripe for the virus spread. (AP Photo/Yong Teck Lim)