 any questions as to how this rally was secured, and the agency says you'll have to direct those to the Secret Service. During last night's press briefing, the FBI did say it was surprised at the number of rounds fired by the named shooter, Thomas Matthew Crooks. The FBI added that their initial assessment leads them to believe law enforcement did not know the shooter was on the roof until the shots were fired. Fox's C.B. Cotton reporting in Butler, Pennsylvania.