OREM, UT — Authorities are still searching early Thursday for the shooter believed to have fired a single gunshot that killed Charlie Kirk , a conservative activist and close political ally of President Donald Trump , at an event at Utah Valley University .

Kirk, 31, was speaking outside in the university's courtyard on Wednesday afternoon. The incident, captured in graphic detail in video clips that rapidly spread around the internet, sparked fear and panic among the some 3,000 attendees, prompting the school to evacuate the campus and close down as authorities investigated.

Authorities are searching for the suspected shooter after two people had been detained in the hours after the shooting, including one who was interrogated by law enforcement. Both were subsequently released.

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