A campus police officer fired shots Friday on the George Mason University campus after another officer was struck by a car she was trying to stop, authorities said.

The incident occurred about 1 a.m. near the Rappahannock River parking garage on the northeast side of the campus in Fairfax , said campus police chief Eric Heath.

Heath said officers were called about two men who appeared intoxicated as they headed toward the garage. After being found, the men ran to a car and , sped through the garage, he said. The officer was struck as she tried to stop the car, Heath said. She was not seriously injured, he said.

He said the second officer, who was backing up the first, fired two shots, No one was hit, he said.

He said additional officers arrived and stopped a vehicle on Route 123.

It was unclear why the men were on campus, Heath said. He said they were not students, or faculty or staff members.