correspondent richard engel is in syria. he joins us live. richard, what can you tell us about this attack? reporter: so, we re learning more about what u.s. forces were doing when this explosion took place. multiple local residents and among them witnesses say that u.s. forces had been on a patrol in the area, and that they would routinely stop at this restaurant, either going in to eat or to pickup food that s correct they would go to this same restaurant, one of only two, a kurdish commander said, that u.s. forces in the area would go to, and that they were there today at 1:00 right around lunch time. that some u.s. forces were inside the restaurant, others were outside talking to locals, presumably guarding the door, when a man in civilian clothing walked in, got right into the doorway itself, and exploded a