A series of eight bomb blasts ripped through high-end hotels and churches holding Easter services in Sri Lanka on Sunday, killing 290 people.
There was no immediate claim of responsibility, but the government said eight people had been arrested and investigators would look into whether the attackers had "overseas links".
Sri Lanka also imposed a nationwide curfew and curbed social media access to prevent "wrong information" from spreading in the country of 21 million people.
The powerful blasts -- six in quick succession and then two more hours later -- injured hundreds. At least two of them involved suicide bombers, including one who lined up at a hotel breakfast buffet before unleashing carnage.