The Islamic State Group took responsibility for a wave of coordinated bomb attacks in churches and high-end hotels in Sri Lanka.
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Sri Lankan Prime Minister Ranil Wickremesinghe confirmed the claim when he asked reporters questions during a press conference in Colombo.
"All we knew in the past was that there were foreign links and that this was not just local," said Wickremesinghe. "There was training and coordination done that we did not see [have] earlier."
At least 310 people were killed and another 500 injured Sunday when explosions occurred almost simultaneously in eight locations on the island island at the southern tip of India.  Three explosions broke out in churches with Easter service, three more in hotels, including some that are often used by Western tourists. According to the Sri Lankan Ministry of Defense, most of the explosions were detonated by suicide bombers.
The first funerals for the victims took place on Tuesday.
At least four Americans had been killed as a US official informed of the investigation. One of the Americans was identified on Monday as Dieter Kowalski, 40, of Denver, according to his mother and Pearson, the London-based global education company that employed him.
At least 45 children were also among the dead, including at least five who were not Sri Lankans, according to Christophe Boulierac, a spokesperson for the United Nations Children's Fund.
Ruwan Wijewardene, the defense minister, told the Sri Lankan parliament on Tuesday that the authorities have information showing that Sunday's bombing was carried out "in retaliation". for the attacks of last month in two mosques in New Zealand, which killed 50 people.
Sri Lanka's Health Minister Rajitha Senaratne accused Monday of the deadly explosion of a little-known domestic Muslim militant group called National Thowfeek Jamaath.
At least 40 suspects were arrested in connection with the Easter explosions across the country, said Sri Lanka Police spokesman Ruwan Gunasekara told ABC News. Twenty-six of them were interviewed by the Department of Criminal Investigations on Tuesday, while three were arrested by the Department of Terrorist Investigations.
ABC News Ben Gittleson, Josh Margolin, Kirit Radia, Nadine Shubailat and Alex Stone contributed to this report.