The suspect leader of Easter Day on the bombings in Sri Lanka died in the Shangri-La Hotel, one of six hotels and churches targeting the attacks that killed at least 250 people, the authorities said.
Police said Mohamed Zahran, leader of the National Towheed Jamaat military group, had been killed in one of the bombings. The group's second command was also arrested, police said.
Zahran gathered an online follower for his hated sermons. Some were delivered before a banner depicted the Twin Towers.
Australia's Prime Minister Scott Morrison said Friday that the bombing attacks were supported by the Islamic state. About 140 people in Sri Lanka were affiliated with ISIS, the Sri Lankan president Maithripala Sirisena said.
"We will totally control this and create a free and peaceful environment for people to live," he said.
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Investigators decided that the attackers received military training from someone called "Army Mohide". They also received arms training abroad and in certain places in Sri Lanka, according to authorities.
A copper factory operator arrested in connection with the bombings helped the Mohide to make improvised explosive devices, police said. The bombings have led to increased security throughout the island nation, as the authorities warned of another attack