A woman wearing a face mask walks past a graffiti reading "Hong Kong" on a beach at Cheung Chau island during Easter weekend, amid the novel coronavirus disease (COVID-19) outbreak, in Hong Kong, China April 12, 2020. REUTERS/Joyce Zhou

A child wearing a face mask plays on a beach at Cheung Chau island during Easter weekend, amid the novel coronavirus disease (COVID-19) outbreak, in Hong Kong, China April 12, 2020. REUTERS/Joyce Zhou

A woman takes off her mask as she eats food during Easter weekend at Cheung Chau island, amid the novel coronavirus disease (COVID-19) outbreak, in Hong Kong, China April 12, 2020. REUTERS/Joyce Zhou

People wearing face masks are seen at Cheung Chau island during Easter weekend, amid the novel coronavirus disease (COVID-19) outbreak, in Hong Kong, China April 12, 2020. REUTERS/Joyce Zhou

A man rides a bicycle at Cheung Chau island during Easter weekend, amid the novel coronavirus disease (COVID-19) outbreak, in Hong Kong, China April 12, 2020. REUTERS/Joyce Zhou

A child wearing a face mask sits on the backseat of a bicycle at Cheung Chau island during Easter weekend, amid the novel coronavirus disease (COVID-19) outbreak, in Hong Kong, China April 12, 2020. REUTERS/Joyce Zhou

Few students are seen in an otherwise full clasroom at a school which opened days after a string of suicide bomb attacks across the island on Easter Sunday, in Batticaloa, Sri Lanka, May 6, 2019. REUTERS/Danish Siddiqui

A student is frisked by a parent as he arrives at his school which opened days after a string of suicide bomb attacks across the island on Easter Sunday, in Batticaloa, Sri Lanka, May 6, 2019. REUTERS/Danish Siddiqui

Soldiers on patrol arrive at a school which opened days after a string of suicide bomb attacks across the island on Easter Sunday, in Batticaloa, Sri Lanka, May 6, 2019. REUTERS/Danish Siddiqui

A student's bag is searched by a parent as he arrives at his school which opened days after a string of suicide bomb attacks across the island on Easter Sunday, in Batticaloa, Sri Lanka, May 6, 2019. REUTERS/Danish Siddiqui

A Sri Lankan army soldier searches a class room at a school as schools second term will start on 6th of May, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

Sri Lankan police officers search a school premises as schools second term will start on 6th, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

Sri Lankan army soldiers search a class room at a school as schools second term will start on 6th of May, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

A Sri Lankan army soldier searches a class room at a school as schools second term will start on 6th of May, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

A Sri Lankan army soldier searches a school premises as schools second term will start on 6th of May, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

A Sri Lankan police officer searches a school premises as schools second term will start on 6th of may, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

Sri Lankan police officers are seen during a search operation at a school premises as schools second term will start on 6th of May, two weeks after a string of suicide bomb attacks on Catholic churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka May 5, 2019. REUTERS/Dinuka Liyanawatte

A soldier stands guard outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

A soldier stands guard as priests walk past him outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Soldiers arrive for deployment outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Soldiers stand guard on an armoured vehicle outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

A soldier stands guard outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Soldiers get ready for deployment outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Soldiers arrive for deployment outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Soldiers stand guard on an armoured vehicle outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Soldiers stand guard outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Residents look through the wall of St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

A soldier stands guard outside St. Sebastian Church, days after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka, May 1, 2019. REUTERS/Danish Siddiqui

Army personnel repair St. Sebastian Church which was damaged during string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Negombo, Sri Lanka, April 30, 2019. REUTERS/Danish Siddiqui

People stand inside the St. Sebastian Church which was damaged during string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Negombo, Sri Lanka, April 30, 2019. REUTERS/Danish Siddiqui

Security personnel stand guard in front of St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

People stand near a security barricade in front of St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

Residents pray in a prayer house near St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

Priests are seen in the background as a security personnel stands guard in front of St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

Residents pray in a prayer house near St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

Security personnel stand guard in front of St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

People stand near a security barricade in front of St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

Security personnel stand guard in front of St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

A Muslim woman wearing a hijab walks through a street near St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka, April 29, 2019. REUTERS/Danish Siddiqui

A man carrying a sack walks past a mosque in a muslim neighborhood of Colombo, Sri Lanka April 29, 2019, a week after a string of suicide bomb attacks across the island on Easter Sunday. REUTERS/Thomas Peter

People cross a street in central Colombo, Sri Lanka April 29, 2019, a week after a string of suicide bomb attacks across the island on Easter Sunday. REUTERS/Thomas Peter

The Archbishop of Colombo, Cardinal Malcom Ranjith (2nd L), Venerable Kirinde Assaji Thero (2nd R) and Muslim leader Mowlavi Nusrath Nowfal (R) attend a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, at Lake House in Colombo, Sri Lanka April 28, 2019. Photo taken April 28, 2019. REUTERS/Thomas Peter

People light candles during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

A member of the Sri Lankan security forces sits on a motorbike as he keeps watch outside St Anthony's Shrine, days after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

A boy holds a candle during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, at Lake House in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

A man lights candles during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, at Lake House in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

A man lights candles during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, at Lake House in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

Women hold candles during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, at Lake House in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

People light candles during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, at Lake House in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

People light candles during a vigil in memory of the victims of a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter

Monks are seen next to a security personnel after a Buddhist ceremony as a tribute to victims, a week after a string of suicide bomb attacks across the island on Easter Sunday, outside Kingsbury Hotel in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

Nicola Wimanna and his family pray for his father and mother, who lost their lifes a week ago after a string of suicide bomb attacks across the island on Easter Sunday, at his home in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha

Nicola Wimanna and his family pray for his father and mother, who lost their lifes a week ago after a string of suicide bomb attacks across the island on Easter Sunday, at his home in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha

A candle burns outside St. Anthony's Shrine a week after a string of suicide bomb attacks across the island on Easter Sunday, in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

Monks take part in a Buddhist ceremony as a tribute to victims, a week after a string of suicide bomb attacks across the island on Easter Sunday, at Kingsbury Hotel in Colombo, Sri Lanka April 28, 2019. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

Theresha Binish, 65, who lost her daughter and 3 grand children, mourns for them at her home, a week after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha

Theresha Binish, 65, who lost her daughter and 3 grand children, mourns for them at her home, a week after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha

Theresha Binish, 65, who lost her daughter and 3 grand children, mourns for them at her home, a week after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha

Theresha Binish, 65, who lost her daughter and 3 grand children, mourns for them at her home, a week after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha

Theresha Binish, 65, who lost her daughter and 3 grand children, mourns for them at her home, a week after a string of suicide bomb attacks across the island on Easter Sunday, in Negombo, Sri Lanka April 28, 2019. REUTERS/Athit Perawongmetha