Schriever (SHREE'-ver) Air Force Base spokeswoman Jennifer Thibault (THEE'-balt) says the building was evacuated after the standoff began on Monday.
She says the airman is a member of a security squadron and is armed with his own handgun. Officials haven't determined his motive.
His name, rank and service history haven't been released.
Schriever is about 60 miles south of Denver. Thibault says the airman is in a building where servicemen and women prepare for deployments. Source