First responders continue to sort through the wreckage of churches and hotels in the cities of Colombo, Negombo and Batticaloa, where eight explosions have killed almost 300 people.
"Mercifully, all three of them died instantly and with no pain or suffering", Mr Nicholson said.
So far, only Sri Lankan citizens have been arrested in connection with the attacks, the PM said. Anita was a wonderful, ideal wife and a brilliant, loving and inspirational mother to our two wonderful children. Police were attempting to defuse explosives in a vehicle used by the attackers when it blew up. Expressing their deepest sympathy and condolences to the families of the victims and to the Government of Sri Lanka, the members of the Security Council reaffirmed that terrorism in all its forms and manifestations constitutes one of the most serious threats to global peace and security. Other Sri Lankans killed included members of church congregations and staff at the hotels targeted. Anders Holch Povlsen, Denmark's wealthiest man and one the largest landowners in Scotland, lost three of his four children.
Who was behind the attacks?
Sri Lanka's government has blamed the blasts on a little-known local Muslim organisation, the National Thowheeth Jama'ath, but also said it believed they could not have been carried out without assistance from "international terror groups".
Government spokesperson Rajitha Senaratne said that the warnings about the blasts were received in the days before the attacks, the CNN reported. "Neither I nor the ministers were kept informed".
Here is an AFP report on the suicide attacks in Sri Lanka on Easter Sunday, April 21, 2019 which have left more than 310 people dead.
The war is thought to have killed between 70,000 and 80,000 people and ended with the defeat of the Tamil Tigers, who had fought for independence for the Tamil minority.