Sri Lanka attackers may have had outside help

Authorities believe the suspects are linked to a local terrorist group that could've had ties to a larger organization.
1:34 | 04/23/19

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Transcript for Sri Lanka attackers may have had outside help
Authorities arrested at least 40 suspects believed to be linked to a local terrorist group and as we heard ISIS is now claiming responsibility. ABC's chief global affairs correspondent Martha Raddatz has more from Washington on that and the possible motive. Good morning, Martha. Reporter: Good morning, Cecilia. It was the defense minister in Sri Lanka who is now saying this was in retaliation for the mosque attack in New Zealand. An Australian charged in that but the Sri Lankan authorities offered no proof although they are under intense scrutiny given the failure to act on clear specific information that a little-known local radical islamist group was planning to attack churches. They were tracking the group but that secret security warning had not been shared with the public and the question is, Cecilia, could lives have been saved? American officials are certainly going to want to know the answer to that. James said the FBI is involved in this now. Do you have a sense of what they've been learning? Reporter: The FBI and others are looking to see what kind of outside help the group may have had including potential links to ISIS. This was clearly well planned with multiple suicide bombings, six different locations and three different cities and while we do not know yet for certain whether ISIS or some other international terror group was involved even despite that claim the sophistication and the horrific nature of this violence including children has all the hallmarks of ISIS or like-minded groups, Cecilia. So much destruction. Thank you.

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

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