OREM, UT – Authorities are still searching for the shooter who killed Charlie Kirk at an event at Utah Valley University , but have identified a rifle believed to have been used to fire the single fatal shot.

A suspect was not identified, but authorities said in an update Thursday that they recovered a high-powered rifle in the woods they believe was used in the shooting and learned new details about a suspect from video being analyzed. Photos of a new person of interest were also released by the FBI on Thursday.

Officials haven't confirmed the shooter's motive or ideology, but President Donald Trump told reporters he has "an indication," which authorites will address in their ongoing investigation.

Kirk, a 31-year-old conservative activist and Trump's close political ally ,

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