A series of bomb blasts struck churches and luxury hotels across Sri Lanka early on Sunday. The coordinated attacks killed at least 250 people, according to a revised death toll on Thursday.
The first wave of bombings struck at the heart of the country's minority Christian community during busy Easter services at churches in the cities of Colombo, Negombo and Batticaloa.
Prime Minister Ranil Wickremesinghe said Tuesday that there are "still people on the run with explosives."
Sri Lankan security forces stood on high alert, as mass funerals continued for victims on Wednesday.