 More information coming out about Thomas Crooks, the 20-year-old registered Republican who attempted to assassinate former President Donald Trump at a Saturday rally. One attendee died and two others were critically wounded. CBS's Scott McFarlane in Butler, Pennsylvania. CBS News saw FBI agents on top of that structure, a few hundred feet from where the former president spoke, from where the shots were fired Saturday. We also know federal agents have tried to get information from the shooter's cell phone, but so far, no update, no information on motive.