OREM, Utah — Authorities said Thursday they have fresh leads in their massive manhunt for a college-age shooter who killed influential right-wing activist Charlie Kirk with a single bullet as he spoke at a Utah college campus.

No suspects were in custody Thursday, more than 20 hours after the shooting, and officials have yet to identify the gunman. However, Robert Bohls, the special agent in charge of the F.B.I.’s Salt Lake City office, said that investigators recovered the weapon they believe was used to kill Kirk — a high-powered bolt-action rifle they found in a wooded area near the campus — as well as the suspect’s footprints and palm prints.

“We are and will continue to work nonstop until we find the person that has committed this heinous crime, and find out why they did it,” Bohls said.

A close ally of President Trump who founded the conservative youth group Turning Point USA, Kirk was killed Wednesday by a single shot fired from the rooftop of a nearby building as he addressed a question about mass shootings at a Utah Valley University campus in Orem.

Investigators are tracking a suspect who appeared to be college age and blended in on campus, Beau Mason, commissioner of the Utah Department of Public Safety, told reporters Thursday morning. They have scoured dozens of feeds from campus security cameras and collected footwear impressions, a palm print and forearm imprints for analysis.

Video of the crowd captured by an attendee shows a lone figure in black dashing across the rooftop of the Losee Center, a building about 150 yards from where Kirk was speaking.

Mason said investigators “are confident in our abilities to track” the shooter and had “good video footage” that they were not ready to release.

“We are working through some technologies and some ways to identify this individual,” he said.

After scouring camera security footage, investigators believe the shooter arrived on campus at about 11:52 am and moved through the stairwells, up to the roof, across the roof to the shooting location, Mason said.

“We were able to track his movements as he moved to the other side of the building, jumped off of the building and fled off of the campus and into a neighborhood,” Mason said. “Our investigators worked through those neighborhoods, contacting anybody they can, with doorbell cameras, witnesses, and have thoroughly worked through those communities trying to identify any leads.”

Bohls said investigators recovered a high-powered, bolt-action rifle in a wooded area where the shooter had fled. A law enforcement source told The Times a Mauser 30-06 was recovered by investigators. Investigators have not said whether the rifle had been traced to an owner.

The Utah Department of Public Safety said Wednesday night its State Crime Lab is working “multiple active crime scenes” — from the site where Kirk was shot to the locations he and the suspect traveled — with the Federal Bureau of Investigation, Utah County Attorney’s office, the Utah County Sheriff’s office, and the local police departments.

Hope for a speedy capture of the suspect faded Wednesday night after the F.B.I. released the man its director, Kash Patel, had said was a subject of the investigation. After thanking local and state authorities for taking into custody “the subject for the horrific shooting,” Patel announced that the man had been released after an interrogation by law enforcement.

“Our investigation continues,” Patel said.

Another man who was taken into custody a few hours earlier was later released after being booked by Utah Valley University police on suspicion of obstruction of justice.

Speaking at the Pentagon Thursday at an event commemorating the Sept. 11 attacks, President Trump said he would posthumously award the Presidential Medal of Freedom to Kirk.

“Charlie was a giant of his generation, a champion of liberty and an inspiration to millions and millions of people,” Trump said.

The shooter is believed to have fired about 20 minutes after Kirk began speaking Wednesday on a grassy campus courtyard under a white canopy emblazoned with the slogan “PROVE ME WRONG.” The event, attended by about 3,000 people, was the first stop on Kirk’s American Comeback Tour of U.S. campuses.

Some experts who have seen videos believe that the assailant probably had experience with firearms, given the precision with which the single shot was fired from a considerable distance.

Videos shared on social media show Kirk sitting on a chair, taking questions in front of a large crowd of people.

“Do you know how many mass shooters there have been in America over the last 10 years?” an audience member asks.

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

Almost immediately, a shot rings out. Kirk falls back, blood gushing his neck. Video show people screaming and fleeing from the event.

The killing — the latest incident in a spate of violent attacks targeting American politicians on the left and the right — led to swift condemnation of political violence from both sides of the ideological divide. But it also led to a blame game.

After President Trump celebrated Kirk as a “patriot who devoted his life to the cause of open debate” and “martyr for truth and freedom,” he said in an evening video broadcast from the Oval Office that “‘radical left” rhetoric was “directly responsible for the terrorism that we’re seeing in our country today.”

Trump — who did not mention recent acts of political violence against Democratic lawmakers — called for a crackdown on leftwing groups.

Even as the House of Representatives observed a moment of silence for Kirk Wednesday when he was still in critical condition, the floor descended into chaos when some Democrats pushed back on a Republican legislator’s request that someone lead the group in prayer.

Florida Representative Anna Paulina Luna, a former conservative influencer and close friend of Kirk, pointed angrily at Democrats. “You all caused this,” she shouted.

Kirk, 31, was one of the Republican Party’s most influential power brokers.

The founder of the influential conservative youth organization Turning Point USA, Kirk had a vast online reach: 1.6 million followers on Rumble, 3.8 million subscribers on YouTube, 5.2 million followers on X and 7.3 million followers on TikTok.

During the 2024 election, he rallied his online followers to support Trump, prompting conservative podcast host Megyn Kelly to say: “It’s not an understatement to say that this man is responsible for helping the Republicans win back the White House and the U.S. Senate.”

Just after Trump was elected for a second time to the presidency in November, Kirk frequently posted to social media from Trump’s Mar-a-Lago estate in Florida, where he had firsthand influence over which MAGA loyalists Trump named to his Cabinet.

Kirk was known for melding his conservative politics, nationalism and evangelical faith, casting the current political climate as a state of spiritual warfare between a righteous right wing and so-called godless liberals.

At a Turning Point event on the Salt Lake City campus of Awaken Church in 2023, he said that gun violence was worth the price of upholding the right to bear arms.

“I think it’s worth it to have a cost of, unfortunately, some gun deaths every single year so that we can have the 2nd Amendment to protect our other God-given rights,” he said. “That is a prudent deal. It is rational.”

Kirk also previously declared that God was on the side of American conservatives and that there was “no separation of church and state.” In a speech to Trump supporters in Georgia last year, he said that “the Democrat Party supports everything that God hates” and that “there is a spiritual battle happening all around us.”