 to me that there will be any major changes in his schedule at all, or for that matter, for the schedule for the whole convention. A source has been briefed, tells ABC News the shooter had no ties to extremist organizations or other individuals. The official says the FBI is investigating Thomas Crook's phone and computer. Pennsylvania State Police Lieutenant Colonel George Bivens. At this time, we have no reason to believe that there is any other existing threat out there. This is ABC News.