Protests of a Turning Point USA event at the University of California, Berkeley, campus Monday sparked arrests and investigation announcements from top U.S. Department of Justice officials, who alleged “Antifa” involvement. The DOJ was already investigating the UC system over various allegations, and the Trump administration has demanded UCLA pay $1.2 billion and make other concessions.

“Antifa is an existential threat to our nation,” Attorney General Pam Bondi posted on X Tuesday. “The violent riots at UC Berkeley last night are under full investigation by the FBI-led Joint Terrorism Task Force.”

Harmeet K. Dhillon, the assistant attorney general supervising the DOJ’s Civil Rights Division, also said her division will investigate. “I see several issues of serious concern regarding campus and local security and Antifa’s ability to operate with impunity in CA,” she wrote on X.

Dan Mogulof, a UC Berkeley spokesperson, told Inside Higher Ed Wednesday that there was only one reported incident of violence: A person with a ticket to the event was hit in the head by a glass bottle or jar thrown from a crowd of protesters. The victim was transported to Highland Hospital by ambulance but was “upright and conscious,” Mogulof said, adding that police are reviewing videos to see who might have thrown the object.

In an incident that Mogulof said people mistakenly believed was connected to the protest, the City of Berkeley Police Department said its officers were monitoring the protest when they saw a fight between two men. Police determined one of them had stolen a chain from the other and the other was attempting to reclaim it, and the man who allegedly stole the chain was arrested on suspicion of robbery and battery resulting in injury.

Mogulof also said campus police arrested two people for allegedly failing to comply with directions and, the night before the protest, arrested four students for alleged felony vandalism for trying to hang something on the historic Sather Gate. At the protest itself, Mogulof said, there were people who “self-identified as Antifa,” but he didn’t know whether they were part of an organized group.

In a statement, the university said, “There is no place at UC Berkeley for attempts to use violence or intimidation to prevent lawful expression or chill free speech. The University is conducting a full investigation and intends to fully cooperate with and assist any federal investigations.”