Update - 12:30 a.m.
The El Paso County Sheriff's Office is reporting that there are no injuries and no active shooter.
Law-enforcement has completed a search of the dorms on Air Force Academy grounds. No injuries and no active shooter. pic.twitter.com/KlS7Od8bXU— EPCSheriff (@EPCSheriff) September 30, 2017
All clear: The incident has concluded. There are no confirmed shots fired & no injuries. Everyone is safe.— USAFA (Official) (@AF_Academy) September 30, 2017
The Air Force Academy was placed on lockdown late Friday after a report of a possible shooter at the Academy's preparatory school.
We received reports of active shooter on Academy grounds. There are no confirmation of shots fired. Security forces are sweeping the area.— USAFA (Official) (@AF_Academy) September 30, 2017
Text alerts were sent to airmen on the 18,500-acre campus warning of the incident.
Text messages provided to the Gazette show the campus went on lockdown just before 10 p.m.
Security forces said they believed the incident was taking place at 5220 Cedar Drive, home of the academy's prep school.
The school has made headlines this week after five black students were targeted with racial slurs left on message boards outside dorm rooms.
The 240-student preparatory school is south of the main cadet area at the academy and near family housing communities. Neighbors in those areas were told to shelter in place.
Air Force officials will continue to investigate the cause of the reports.