Conservative activist Charlie Kirk has been shot while speaking to students at an event at Utah Valley University, in an attack caught on camera.
Mr Kirk, a fervent supporter of President Donald Trump, is the founder of Turning Point USA, a group that seeks to spread conservative ideas to students on US campuses.
Officials say he was shot once, and his condition is currently unknown. The campus is on lockdown and police have arrested one gunman.
The FBI is assisting in the investigation. Trump has posted, “We must all pray for Charlie Kirk, who has been shot. A great guy from top to bottom. God bless him.”
Scott Trotter, a spokesman for Utah Valley University in Orem, told the BBC that the shot was fired at 12:25 local time (18:25 GMT).
“A single shot rang out in the quad near the food court on the Utah Valley University Orem Campus as Mr Charlie Kirk began speaking at his planned rally,” he said.
“We can confirm that Mr Kirk was shot, but we don’t know his condition.”
BBC Verify has confirmed the authenticity of several videos of the shooting which have been posted online.
One video shows students crowded around a white tent emblasoned with the words, “THE AMERICAN COMEBACK” and “PROVE ME WRONG”.
Charlie Kirk can be seen sitting alone under the tent with several others standing nearby.
In another video verified by the BBC, Mr Kirk is seen speaking at the rally for around four seconds, before a single gunshot is heard.
He then appears to jolt backwards in his chair, before the camera pans away and the crowd begins to run in panic.
Politicians from across the political spectrum, as well as right-wing influencers, have condemned the attack.
“FBI and ATF agents are on the way. PRAY FOR CHARLIE,” wrote Attorney General Pam Bondi, the highest-ranking US law enforcement official.
Health Secretary Robert Kennedy wrote: “We love you Charlie Kirk. Praying for you.”
California Governor Gavin Newsom, a Democrat and one of Trump’s top political rivals, called the attack “disgusting, vile, and reprehensible.
“In the United States of America, we must reject political violence in EVERY form.”
A former Utah congressman who witnessed the attack described to Fox News how “everyone hit the deck” and “scattered” after the gunshot was heard.
“The shot came straight at him,” Jason Chaffetz said, adding he had talked to the Kirk just before the event started.
As the news broke at the White House, several of Trump’s staff members in the press office were seen becoming visibly emotional.
“Oh my god, Charlie Kirk has been shot!” one young female White House official exclaimed, eliciting gasps from others in the press office.
The staffer got up from her desk, still looking at her phone and quickly walked out of the area.
