Police and FBI agents actively searching for Charlie Kirk's killer in Utah say they recovered a "high-powered" bolt-action rifle believed to have been used by the suspect. While the shooter's identity has not been announced, the FBI has released images of a person of interest.

Kirk, 31, was a conservative activist and a close political ally of President Donald Trump. He was speaking in an outside courtyard to a crowd of about 3,000 attendees on the campus of Utah Valley University in Orem, Utah, when he was shot and killed by an unknown assailant on Sept. 10.

Law enforcement officials described the attack as targeted, not random. During a news conference on Sept. 11, officials said they found a rifle ‒ believed to have fired the single fatal shot from a nearby rooftop ‒ in a wooded area.

Here is what we know so far about the shooting. All times are local and approximate:

11:52 a.m.: The shooting suspect arrives on campus, according to Beau Mason, Utah Public Safety Commissioner.