OREM, Utah — Charlie Kirk, a conservative activist and close ally of President Donald Trump who played an influential role in rallying young Republican voters, was shot and killed Wednesday at a Utah college event in what the governor called a political assassination carried out from a rooftop.

“This is a dark day for our state. It’s a tragic day for our nation,” said Utah Gov. Spencer Cox. “I want to be very clear this is a political assassination.”

It wasn’t immediately clear late Wednesday whether any suspect was in custody or if the shooter was still at large as law enforcement provided evolving and difficult-to-reconcile information. FBI Director Kash Patel, who earlier in the day posted on social media that a “subject” had been taken into custody, later wrote that the person had been released after being questioned. Utah authorities had separately said a person of interest was in custody, but it wasn’t immediately clear if that was the same person Patel referenced as having been released.

Authorities did not immediately identify the person who had been in custody, a motive or any criminal charge.

But the circumstances of the shooting drew renewed attention to an escalating threat of political violence in the United States that in the last several years has cut across the ideological spectrum. The assassination drew bipartisan condemnation but a national reckoning over ways to prevent political grievances from manifesting as deadly violence seemed elusive.

Videos posted to social media from Utah Valley University show Kirk speaking into a handheld microphone while sitting under a white tent emblazoned with the slogans “The American Comeback” and “Prove Me Wrong.” A single shot rings out and Kirk can be seen reaching up with his right hand as a large volume of blood gushes from the left side of his neck. Stunned spectators are heard gasping and screaming before people start to run away. The Associated Press was able to confirm the videos were taken at Sorensen Center courtyard on the Utah Valley University campus.

Kirk was speaking at a debate hosted by his nonprofit political organization. Immediately before the shooting, Kirk was taking questions from an audience member about mass shootings and gun violence.

“Do you know how many transgender Americans have been mass shooters over the last 10 years?” the person asked. Kirk responded, “Too many.”

The questioner followed up: “Do you know how many mass shooters there have been in America over the last 10 years?”

“Counting or not counting gang violence?” Kirk asked.

Then a single shot rang out. The shooter, who Cox pledged would be held accountable in a state with the death penalty, wore dark clothing and fired from a roof on campus some distance away.

The death was announced on social media by Trump, who praised the 31-year-old Kirk, the co-founder and CEO of the youth organization Turning Point USA, as “Great, and even Legendary.”

“No one understood or had the Heart of the Youth in the United States of America better than Charlie,” Trump posted on his Truth Social account.

Utah Valley University said the campus was immediately evacuated and remained closed. Classes were canceled until further notice. Those still on campus were asked to stay in place until police officers could safely escort them off campus. Armed officers walked around the neighborhood bordering the campus, knocking on doors and asking for information on the shooter.

Officers were seen looking at a photo on their phones and showing it to people to see if they recognized a person of interest.

The event, billed as the first stop on Kirk’s “The American Comeback Tour,” had generated a polarizing campus reaction. An online petition calling for university administrators to bar Kirk from appearing received nearly 1,000 signatures. The university issued a statement last week citing First Amendment rights and affirming its “commitment to free speech, intellectual inquiry, and constructive dialogue.”

Last week, Kirk posted on X images of news clips showing his visit was sparking controversy. He wrote, “What’s going on in Utah?”