 I'm Peter McArthur, WDEL News. Among your top stories this morning, the investigation of the assassination attempt on former President Trump is already pointing to serious flaws in security at the rally. More video from the scene appears to show bystanders trying to warn police just before the shooting. Charlie DeMar is in Butler, PA. The Butler County Sheriff says his department, which was on scene, was not responsible for sweeping the roof where the shooter was perched. The Sheriff's Office was not asked to do that.