Authorities identified the firearm they believe was used to shoot and kill conservative activist Charlie Kirk, officials said on Thursday.

Driving the news: Officials said they tracked the alleged gunman's movements before and after the shooting, but a manhunt for the suspect is still ongoing. • Authorities are searching for what they believe to be a "college-age" suspect.

Context: Kirk died on Wednesday after being shot at a Turning Point USA event at Utah Valley University. • In a video released after Kirk's death, President Trump vowed to target political violence and said "radical left" rhetoric "is directly responsible for the terrorism that we're seeing in our country today, and it must stop right now."

Zoom in: The weapon believed to be used is a bolt-action rifle, recovered

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