The FBI has released photos of a person of interest in the shooting death of Charlie Kirk.

Kirk, the conservative activist and founder of Turning Point USA, was shot and killed at Utah Valley University Wednesday afternoon during the first stop of his American Comeback Tour.

Kirk was speaking to a crowd of about 3,000 people when a single gunshot was heard and Kirk's head thrust back as he fell, video shows. Kirk had a security detail and there was a small police presence at the event, but there was no security check for people who attended.

At a news briefing Thursday morning, authorities said the suspect appears to be college-aged and "blended in" with students on campus. Investigators found what they believe was the murder weapon, a high-powered bolt-action rifle, in a wooded area

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