ISIS claims responsibility for Sri Lanka bombings

The terror group issued a formal statement identifying the seven suicide bombers who detonated explosive-laden vests at churches and hotels, killing over 350 people.
2:10 | 04/24/19

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Transcript for ISIS claims responsibility for Sri Lanka bombings
Now to new developments in that deadly terror attack in Sri we're learning more about the identity of the bombers, one of them a woman and authorities are making more arrests as the death toll continues to climb. ABC's James Longman is on the scene in Colombo. Reporter: 20 more people have been arrested meaning 60 are now in police custody. Some of the booby-trapped vehicles have been found but the hunt is still on for more bombs as we discover a woman was part of the plot. With the death toll at now at least 359 this is probably ISIS' deadly ever single attack. Watch in this chilling video you can see one of the bombers about to set off his explosive brushing past a little girl with a bomb on his back only to kill scores of children moments later. A woman was part of the plot and set off a suicide vest at this safe house that killed her, two children and three police officers hours after the suicide bombings on Easter Sunday. What's interesting, it's owned by an said whose other property was raided back in January and found explosives at that time. Seem to be pretty extraordinary security lapses. Reporter: The FBI now joining the investigation poring over new surveillance images. Authorities looking at the men in this video wearing backpacks in a hotel video. ISIS has claimed responsibility. There were foreign links that this could not have been just Reporter: While ISIS has claimed responsibility they have yet to offer proof. Sri Lankan officials were given warnings but did not act on the tips. They say it was revenge for what happened in New Zealand but the prime minister there saying that's not the case. We haven't received any intelligence reports that corroborate what's been said in Sri Lanka. Reporter: Now, critical locations are all being secured. Airports, embassies and churches, stepped up security and this country is trying to mourn but still braced for further attacks. They sure are. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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