Fort Bragg authorities temporarily evacuated one of the largest buildings on the North Carolina Army post after safety alarms were triggered.

Normal operations resumed around 3:35 p.m. Thursday at the building that houses U.S. Army Forces Command and U.S. Army Reserve Command.

Army spokesman Paul Boyce said alarms went off about two hours earlier, forcing about 800 people to evacuate.

Firefighters and law enforcement officers searched each floor of the building before giving an all-clear. Boyce declined to say what triggered the alarm.

Boyce said some people who work in the building were sent home, while others waited in adjacent buildings.