Devastating Easter bombings in Sri Lanka were retaliation for recent deadly attacks on mosques in New Zealand, a Sri Lankan official said on Tuesday.

Axar.az reports citing Reuters.

No group has claimed responsibility for the coordinated attacks, which officials said were carried out by at least seven suicide bombers, on three churches and four hotels. The toll rose to 321 dead with about 500 people wounded.

“The initial investigation has revealed that this was in retaliation for the New Zealand mosque attack,” junior minister for defense Ruwan Wijewardene told parliament.

He did not elaborate on why authorities believed there was a link to the killing of 50 people at two mosques in the New Zealand city of Christchurch during Friday prayers on March 15. A lone gunman carried out those attacks.

The ISIS has taken responsibility for the terrorist attack.