Multiple videos from the scene show graphic details about the killing of conservative commentator and political organizer Charlie Kirk at a university in Utah on Wednesday.

Authorities are now poring over the video as part of the investigation into Kirk’s killing. They are still looking for the gunman after briefly detaining and then freeing two people of interest.

Charlie Kirk speaks before he is fatally shot during an event Wednesday at Utah Valley University in Orem, Utah.

(Tess Crowley / Deseret News / AP)

The shooting

Kirk drew a large crowd to the event at Utah Valley University. He was gunned down at 12:20 p.m. while talking about mass shootings.

“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, Kirk is shot in the neck. One video shows blood pouring from the wound as he falls over. As the crowd realizes what has taken place, people are heard screaming and running away.

“This incident occurred with a large crowd around. There was one shot fired, one victim,” Beau Mason, commissioner of the Utah Department of Public Safety, said on Wednesday afternoon. “While the suspect is at large, we believe this was a targeted attack toward one individual.”

Members of the crowd screamed and ran after a gunshot was heard and Kirk toppled from his chair.

(Tess Crowley / Deseret News / AP)

The shooter is believed to have fired from the roof of a building at Kirk as he participated in the public event in the student courtyard, where around 3,000 people were gathered, according to the Department of Public Safety.

A source familiar with the investigation told The Times that a bullet struck Kirk’s carotid artery.

Moments later, many in the crowd begin running.

Jeffrey Long, chief of the university’s Police Department, said six of the force’s officers, including some plainclothes officers embedded in the crowd, were working with members of Kirk’s personal security team to manage safety at the event.

The shooter

Several videos show a person who appears to be dressed in black moving on the roof of university’s Losee Center moments before the gunfire.

Mason, of the Utah Department of Public Safety, said authorities were analyzing campus security video that showed a suspect in dark clothing who might have shot at Kirk from a roof.

The gunman is believed to have killed Kirk from at least 200 yards away using some type of sniper rifle, law enforcement sources told The Times.

Allison Hemingway-Witty cries after the shooting.

(Tess Crowley / Deseret News / AP)

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.

Witness Seth Teasdale told the Salt Lake Tribune that the gunshot was so loud it echoed across the pavilion where Kirk was speaking.

Brynlee Holms told the Tribune the shot was “super loud,” which added to the panic in the crowd.

“I just heard a clear shot, ‘Boom!’ And that was it,” another witness told KUTV.

Police detained George Zinn and Zachariah Qureshi as suspects and later released them after determining they had no ties to the shooting, according to the Department of Public Safety. The manhunt for the shooter continues.

What is not shown

No videos have surfaced showing the gunman firing the shot or fleeing the scene.

Mason said authorities were reviewing closed-circuit television video. “We’re analyzing it, but it is security camera footage, so you can kind of guess what the quality of that is,” Mason said. “We do know [the suspect was] dressed in all dark clothing. We don’t have a much better description.”

Utah Gov. Stephen Cox called the attack “a political assassination” and said Wednesday was “a dark day for our state” and “a tragic day for our nation.”

Law enforcement was working “multiple active crime scenes” including the area Kirk was shot as well as the locations where the suspect and victim traveled, according to the Public Safety Department. They did not provide any further information on the suspect.

The FBI created a tip line to gather information that may lead to the shooter’s arrest.