The U.S. embassy in Sri Lanka also urged its citizens to avoid places of worship over the coming weekend.

Sri Lankan police said an Egyptian and several Pakistanis were among those detained overnight, although there was no immediate suggestion they had direct links to the attacks.

Sri Lankan police say there were no casualties.

Dozens of Calgarians showed their support for victims of the Sri Lankan bombings at city hall on Tuesday and Wednesday.

The purported leader of an Islamic extremist group blamed for an Easter attack in Sri Lanka that killed over 320 people began posting videos online three years ago calling for non-Muslims to be "eliminated," faith leaders said Tuesday.

Jacinda Ardern's office issued a statement responding to the Christchurch claim that described Sri Lanka’s investigation as “in its early stages.”

An explosion went off on Monday in a van near a church in Sri Lanka where scores were killed the previous day, when bomb squad officials were trying to defuse it, a Reuters witness said.

Sri Lankan officials failed to heed warnings from intelligence agencies about the threat of an attack by a domestic radical Muslim group that officials blame for Easter Sunday bombings that killed more than 200 people, the country’s health minister said Monday.

Bhanuka Harischandra was running a little late for his meeting Sunday. As a car carrying him pulled into the back entrance of the luxury Shangri-La Hotel in Sri Lanka's capital of Colombo, he realized something was wrong.

Prayers were said for victims of the Sri Lankan attacks at Calgary churches on Easter Sunday.