Charlie Kirk, the conservative firebrand and founder of Turning Point USA, has been shot at a Utah Valley University event in Orem, Utah.

Graphic video posted to social media shows Kirk on stage, sitting in a chair, talking into a microphone. A single gunshot was heard and Kirk's head thrust back as he fell. People started screaming and running away, the video shows.

Kirk, 31, was on campus for the first stop of his American Comeback Tour .

Charlie Kirk shot

What we know:

According to the university, shots were fired from a nearby building around 1:20 p.m. local time, about 20 minutes after he started speaking.

"We believe that he was shot," the university told FOX TV Stations.

A suspect is in custody, according to the school, and campus has been closed for the remainder of the

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