The gunman who shot dead US right-wing youth leader Charlie Kirk in a targeted killing remained at large Thursday but authorities said they have video images of the suspect and have recovered a "high-powered" rifle.

Kirk, a 31-year-old superstar on the Republican right who was credited with helping Donald Trump return to the presidency last year, was shot while addressing a large crowd at Utah Valley University on Wednesday.

The killing -- described by the FBI as a "targeted event" -- shocked a nation already reeling from political tensions half a year into Trump's second term.

Authorities acknowledged the gunman remained at large after having escaped into woodland.

"We're doing everything we can to find him, and we're not sure how far he has gone yet, but we will do our best," FBI Spe

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