A manhunt continues Thursday as law enforcement officials search for the suspect responsible for fatally shooting conservative activist Charlie Kirk at the Utah Valley University campus on Wednesday.Kirk was speaking at a debate hosted by the conservative youth organization Turning Point USA when he was shot and killed. Kirk was the CEO and co-founder of Turning Point USA.What we know about the shooterPolice are still working to identify the shooter.The suspect targeted Kirk, firing a single shot from a distant rooftop, according to Commissioner of the Utah Department of Public Safety Beau Mason. Authorities said the suspect "appears to be of college age" and "blended in" with students on the college campus.Authorities said the suspect arrived on campus just before noon. After firing the shot, the shooter jumped from the roof, moved through stairwells and ultimately fled from campus into a neighborhood. A high-powered, bolt-action rifle was found in a wooded area where the shooter fled, according to the FBI. The shooter is still on the run, and it is not clear how far the suspect may have gotten, but the nearby woods have been secured, authorities said.Officials are reviewing grainy security videos of a person in dark clothing. "We do have good video of this individual," Mason said.Federal, state and local authorities were working what they called "multiple active crime scenes." Are there other suspects?A person of interest was taken into custody Wednesday evening after the shooting, but has since been released, Utah Gov. Spencer Cox said. No charges were filed. Officials had no information indicating a second person was involved, according to Cox. Two other people were detained Wednesday, but neither was determined to be connected to the shooting and both were released, public safety officials said. The Associated Press contributed to this report.