State and federal authorities released a joint update on Wednesday night on the assassination of conservative commentator Charlie Kirk at Utah Valley University, saying that two people had been detained for questioning and later released.

In a press release issued by the Utah Department of Public Safety and the FBI, authorities said that George Zinn and Zachariah Qureshi had been taken into custody as suspects and questioned, but law enforcement found “no current ties to the shooting with either of these individuals.” The statement added, “There is an ongoing investigation and manhunt for the shooter.”

“The shooting is believed to be a targeted attack. The shooter is believed to have fired from the roof of a building down to the location of the public event in the student courtyard. Any additional clarifications cannot be provided to protect the integrity of our investigation,” authorities said.

Zinn, a 71-year-old man, is known in the Salt Lake City area for disrupting political events and has a criminal history dating back to the 1980s, The Salt Lake Tribune reported. In 2013, Zinn was charged with threatening to place bombs at the finish line of the Salt Lake City marathon. Zinn agreed to a plea deal in that case and was sentenced to probation. However, after he failed to meet the conditions of his probation, he was ordered to spend a year in jail, with credit for time served, according to the Tribune. Zinn was arrested again in 2019 after a protest in downtown Salt Lake City turned violent.

Salt Lake County District Attorney Sim Gill told the Tribune on Wednesday that Zinn leaned libertarian and would “give me a hard time for being a Dem.” He added that at “almost every political event you can think of, there was always George somewhere in the background, listening.”

The FBI began investigating shortly after Kirk was shot. The two subjects questioned by the FBI were released after FBI Director Kash Patel said earlier on Wednesday that the suspected assassin had been taken into custody. Patel later said, “The subject in custody has been released after an interrogation by law enforcement. Our investigation continues and we will continue to release information in interest of transparency.”

According to officials, the Utah Valley University Police Department had six officers working the Kirk event, which was in addition to Kirk’s security detail. Around 3,000 people were in attendance to listen to Kirk when a gunman fired a single shot from the roof of a building near where Kirk was speaking at approximately 12:20 p.m. local time, according to authorities. Kirk was taken to Timpanogos Regional Hospital, where he was pronounced dead “hours later.”

The assassin is believed to have fired from the Losee Center building, which was at least 200 yards away from where Kirk was speaking in a courtyard on campus. Law enforcement has not released a description of the suspected assassin.

The FBI urged the public to send in any information about the assassination to a tip line.