Gunman opened fire at Trump rally as witnesses say they tried to alert police

As federal investigators continue to probe how a gunman managed to climb atop a roof and fire a barrage of shots at former President Donald Trump in an apparent assassination attempt on Saturday, multiple witnesses said they tried to point out the suspect to police and Secret Service agents before gunfire erupted.

Roughly eight minutes after Trump took the stage at a campaign rally in Butler Township, Pennsylvania, witnesses said they saw the alleged gunman shimmying up the sloping roof of the American Glass Research building outside the security perimeter of the rally. The building is within 400 feet of the rally stage where Trump was speaking.

Witness Ryan Knight, who was working at the rally selling pizza slices and bottled water with his boss, said he was standing outside the security perimeter at a fence line when someone standing next to him said “This guy’s got a gun” and pointed.