*> ISIS had claimed credit for the attack, according to one YouTube video; in it...

> ISIS had claimed credit for the attack, according to one YouTube video; in it, a man showed his TV screen, tuned to an Arabic news channel, on which masked ISIS fighters delivered a speech next to looping footage of an explosion.

This linked to the wrong video, the actual link is https://www.youtube.com/watch?v=E2J6RvajSaA

Edit: He fixed it.