 that apparently the FBI is now working on the lone assassin theory. But there are too many videos of witnesses, people who participated in this rally, who said they warned the police two to three minutes ahead of the shooting that there was a man on the roof. And apparently, a police officer then tried to climb up on the roof. The guy, the shooter, aimed his weapon at the policeman. Then the policeman was climbing down, and then the shooter turned around and shot the president.