A woman reacts during a mass burial of victims, two days after a string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, at a cemetery near St. Sebastian Church in Negombo, Sri Lanka April 23, 2019. Mass funeral services and burials marked a national day of mourning for victims of Easter Sunday's church and hotel bombings. REUTERS/Athit Perawongmetha

Coffins of victims are carried during a mass burial of victims, two days after a string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Colombo, Sri Lanka April 23, 2019. REUTERS/Dinuka Liyanawatte

A woman who lost her husband and two children during the bombing at St Sebastian's Church yells towards the graves during a mass burial for victims at a cemetery near the church in Negombo, three days after a string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Sri Lanka April 24, 2019. REUTERS/Thomas Peter

Coffins are laid in the ground during a mass burial for victims at a cemetery near St Sebastian's Church in Negombo, three days after a string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Sri Lanka April 24, 2019. REUTERS/Thomas Peter

A woman reacts next to two coffins during a mass burial of victims, two days after a string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, at a cemetery near St. Sebastian Church in Negombo, Sri Lanka April 23, 2019. REUTERS/Athit Perawongmetha

A coffin is laid in the ground during a mass burial for victims at a cemetery near St Sebastian's Church in Negombo, three days after a string of suicide bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Sri Lanka April 24, 2019. REUTERS/Thomas Peter