Who Will Claim Responsibility for Istanbul Terror Attack?

ABC News' Martha Raddatz on whether ISIS is claiming responsibility for the attack that left 41 dead.
1:10 | 06/29/16

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Transcript for Who Will Claim Responsibility for Istanbul Terror Attack?
Raddatz. You've been talking to your sources. As Brian was saying, all signs right now pointing to Isis. That's right, George. It was clear within hours this was likely the work of Isis. This is the kind of place Isis attacks. And exactly the international attention they strive to achieve. Anytime you hit a transportation hub or an airplane, the impact of the bombing is magnified. Isis expect OFD bringing down the airliner in Egypt. That border so porous. Fighters have tried to go through Turkey to Syria. Exactly. Turkey borders both Syria and Iraq. We followed in the footsteps recently of three british teenagers who arrived at the very airport that was attacked yesterday who then took a bus to the border and crossed into Syria to join Isis fighters. It was very easy for them to get there. Even these inexperienced teen agers. Thank you. Here in the U.S., security

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

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