Investigators have reportedly found ammunition with transgender and antifascist ideology engraved on it in the bolt-action rifle recovered in connection with the killing of Charlie Kirk in Utah.

Those details were included in an internal law enforcement bulletin. Authorities updated the investigation on Thursday but did not disclose that information.

The FBI continues to hunt for the gunman and officials say they have “good footage” of the shooter. The agency is offering a $100,000 reward for information leading to the culprit’s capture.

The Salt Lake City FBI office released two images of a “person of interest” in connection with the case on Thursday morning. They show a young person wearing a dark long-sleeved shirt with an American flag on the front, sunglasses, and a baseball cap. The person is seen walking up stairs and appears to be wearing jeans and white shoes.

The office says the suspect is believed to be college aged and “blended in well” at the campus of Utah Valley University at Orem, Utah.

The FBI special agent in charge in the Salt Lake City office, Robert Bohls, says agents recovered a high-powered bolt action rifle in a wooded area where the shooter escaped from the scene.

Agents also said publicly that they collected for analysis an impression of a shoe the suspect wore, a palm impression, and forearm imprints.

The commissioner of the Utah Department of Public Safety, Beau Mason, says the gunman arrived at 11:52 a.m. Officers tracked his movement across campus and through stairwells of the building to the roof he used to carry out the shooting.

After firing the shot that killed Kirk, he moved to the other side of the building and jumped down and fled off of the campus into the woods where the gun was found.

He then ran into a neighborhood and fled.

“We do have good video footage of this individual but are not going to release it at this time,” Mr. Mason said earlier, before the images were released. He says officers are using technology to try to identify the gunman.

Kirk was killed in a campus courtyard Wednesday in front of a large crowd. Mr. Mason says he spoke to Kirk’s family last night.

“The family is devastated. As commissioner of public safety, as a father, and a husband, I can only imagine what that family is going through.”

The FBI says it has already received 130 tips related to the case.

“I understand there are a lot of questions about motives. I assure you, all leads and tips are being fully investigated,” Mr. Bohls said.