ANCHORAGE, Alaska (AP) — A man suspected of threatening hospital security officers with a gun has been jailed on suspicion of assault and weapons misconduct.

Matthew D. Johnston, 23, was detained by University of Alaska Anchorage police and turned over to Anchorage police.

Police just before 11 a.m. Tuesday took calls from security officers at the Alaska Native Medical Center reporting a prowler in a parking garage. Security officers confronted the man but said he pulled a handgun from his waistband.

The man fled on foot and security officers followed at a distance. The man noticed he was followed and fired two shots into the air, police said. He continued down a trail and fired two more shots, police said. No one was injured.

Police officers set up a perimeter. As they searched, university police reported they had a suspect in custody less than a half mile west of the Alaska Native Medical Center. The man was identified as Johnston.

He was held on an outstanding warrant. Online court documents do not list his attorney.