terrorism

Updated at 2:25 p.m. ET

The Islamic State has claimed responsibility for the devastating Easter Sunday bombings in Sri Lanka, according to a posting by the group's Amaq news agency Tuesday.

Without offering evidence of its involvement, the group commonly known as ISIS said the suicide attacks that killed more than 320 people were carried out by "fighters of the Islamic State."

Updated at 2:15 a.m. ET Tuesday

Police in Sri Lanka have arrested 40 suspects since a wave of deadly suicide attacks Sunday killed more than 300 people and wounded hundreds more. President Maithripala Sirisena on Monday granted the military sweeping powers to arrest and detain suspects.

Updated at 1:11 a.m. ET Tuesday:

The Sri Lankan government has blamed the National Thowfeek Jamaath, a little-known Muslim militant group, for the coordinated attacks on churches and hotels that rocked the island nation on Easter Sunday.

Sri Lankan Health Minister Rajitha Senaratne says the small group was aided by an international network.

Updated at 12:55 p.m. ET

The Trump administration is designating Iran's Islamic Revolutionary Guard Corps as a foreign terrorist organization, taking an unprecedented step as it seeks to increase pressure on Iran's regime. The move seems certain to bring a new level of tension between the two countries, as Iran's leaders have said they will retaliate in kind.

Iranian lawmakers have prepared legislation that would label part of the U.S. military as a terrorist group, according to Iran's state-run IRNA news agency.

At the main operations room inside the National Counterterrorism Center, the flow of incoming data never stops. Analysts from across the government sit in front of their blinking computers, all facing huge TV screens tuned to news channels.

"On a daily basis, 10,000 reports come across our ops center and eyes are put on every one of those," said Russ Travers, deputy director of the center, who has been here, on and off, since it was established 16 years ago.

Updated at 4:37 a.m. ET

Forty-nine people are dead and at least 20 are seriously injured in what New Zealand Prime Minister Jacinda Ardern says "can now only be described as a terrorist attack."

Updated at 9:40 p.m. ET

A federal grand jury in Albuquerque has indicted five residents of a rural New Mexico compound on new terrorism-related charges connected to an alleged conspiracy to attack FBI and military personnel.

Updated at 11:55 a.m. ET

The U.S. State Department is offering a reward of $1 million for information leading to the location of Hamza bin Laden, the son of 9/11 mastermind Osama bin Laden.

Acting on a tip about explosives at a house in Lake Helen, Fla., police discovered jars of highly volatile triacetone triperoxide, or TATP — the same material used in terrorist bombing attacks mounted by ISIS and al-Qaida. Jared E. Coburn, 37, was arrested after officers were told he had a bomb under his bed.

Police in Australia shot and killed a knife-wielded assailant who stabbed three people, killing one, in a busy section of Melbourne on Friday.

The Islamic State claimed responsibility for the attack and authorities say they are investigating it as an act of terrorism.

Witnesses told the Australian Broadcasting Corporation that a four-speed utility truck sped down Bourke Street in the southern Australia city's central business district and crashed after missing a tram.

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