Ah, I linked to this video yesterday
U.S. Citizen in Suicide Act in Syria, Officials Say

A United States citizen working in Syria with a militant group backed by Al Qaeda conducted a suicide bombing there Sunday, in what is believed to be the first time an American has been involved in such an attack, American officials said Wednesday.
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A photo circulated on jihadist social media accounts showed a smiling young man who was said to be the bomber. He had a blond beard and was holding a cat to his chest.

Activists also circulated a video that was said to record the attack. It first showed rebels loading what appear to be tank shells into a large vehicle that had been armored with metal plates. In the video, there is a large explosion after the vehicle drives down a road.