 And the suspect, 20-year-old Thomas Matthew Crooks, was shot and killed by a Secret Service sniper. Greg Smith was at the rally and tells BBC News he and other people saw someone on a rooftop crawling around with a rifle. We were pointing at him for the Secret Service who were looking at us from the top of the barn. They were looking at us the whole time we were standing by that tree. Could they see him? Probably not, because the roof, the way the slope went, he was behind where they could see. But why is there not Secret Service on all of these roofs here?