Police and federal agents are mounting an intense manhunt for the sniper who fired the single gunshot that killed conservative activist Charlie Kirk as he was fielding questions about gun violence at a university.

Kirk, 31, a podcast-radio commentator and an influential ally of Donald Trump, is credited with helping build the Republican president's base among younger voters.

He was gunned down on Wednesday in what Utah Governor Spencer Cox called a political assassination.

The slaying, captured in graphic detail in video clips, occurred during an event attended by 3000 people at Utah Valley University in Orem, south of Salt Lake City.

In one clip, blood could be seen gushing from Kirk's neck immediately after a shot rang out, and he slumped in his chair.

Kirk, co-founder and president

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