ISIS has claimed responsibility for the bombings in Sri Lanka, which killed 321 people and injured 500 others, the group’s AMAQ news agency has said.
The group did not give any evidence for the claim.
This comes as the police have arrested 40 suspects in the Sri Lanka attacks, including the driver of a van allegedly used by the bombers and the owner of a house where some of them lived, officials said.
The death toll from Sunday's attacks has risen to 310, police spokesman Ruwan Gunasekara said.
The six near-simultaneous attacks on three churches and three luxury hotels, along with three related blasts later on Sunday, were the South Asian island nation's deadliest violence in a decade.