Trump supporters seen in chilling video trying to warn police of rooftop gunman moments before shots ring out

Cellphone video taken on Saturday shows panicked Trump rally attendees pointing at shooter Thomas Matthew Crooks and yelling to alert police as he shimmied across a roof and into position minutes before he fired.

Video from the scene appears to show attendees trying to alert authorities to the shooter's presence 86 seconds before Crooks fired.

In other footage taken of the incident, people were seen running from the area about 15 seconds before shots were fired, while others were heard yelling that the man on the roof had a gun.