Isis has claimed responsibility for the Easter Sunday bomb attacks in Sri Lanka that killed at least 321 people.
The Islamic State group has offered no evidence to back the claim, but it comes as a junior defence minister in Sri Lanka said the attacks were in retaliation for the New Zealand mosque shootings.
The extremist group made the claim on Tuesday via its Aamaq news agency, saying: "The perpetrators of the attack that targeted nationals of the countries of the coalitions and Christians in Sri Lanka before yesterday are fighters from the Islamic State."
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It offered no photographs or videos of attackers pledging their loyalty to the group.
The group, which has lost all the territory it once held in Iraq and Syria, has made a series of unsupported claims of responsibility.
Sri Lankan officials have blamed two local Islamic extremist group for the attack - with suspected links to foreign militants.
The government has said at least seven suicide bombers were involved.
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Junior minister for defence Ruwan Wijewardene told parliament: "The initial investigation has revealed that this was in retaliation for the New Zealand mosque attack.
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.
More than 500 people are thought to have been wounded in the explosions across Sri Lanka.
Around 40 people - including a Syrian national - have since been arrested in a series of raids.
