Footage shows PA Butler Rally Attendees Trying to Alert Law Enforcement to Shooter on Roof

Footage from former President Trump's rally in Butler, Pennsylvania shows rallygoers attempting to alert police to the shooter on a nearby rooftop before shots were fired on Saturday.

The shooter, Thomas Matthew Crooks, could be seen climbing into position in the video. He soon fired several shots at Trump, striking the former president and three crowd members, one of whom was killed.

Local law enforcement had responsibility for the building where Crooks was positioned, Fox News has learned. The building was a "rally point" for one of the local counter sniper teams, according to a federal law enforcement official familiar with the security plans. 

The source also said that a team was actually stationed in, or near, the building. There were four counter sniper teams at the Trump rally in Butler, Pennsylvania, on Saturday, including two from the Secret Service and two from local law enforcement.

The source also added that the Butler County Sheriff’s Department has confirmed that one officer climbed up onto the roof, saw Crooks armed with a rifle and retreated. Soon after that, Crooks began to fire, according to the source. Moments later, a Secret Service counter sniper fired on, and killed, Crooks.