A teenager told police a man assaulted her Tuesday night in a Falls Church library restroom, authorities said Thursday..

According to the Fairfax County Police, the 17-year-old said she ducked into a restroom at the Thomas Jefferson Library at 7415 Arlington Blvd. at about 9 p.m. because she believed a man was following her.

The man followed her into the restroom, refusing her order to leave, according to police. He then touched and pushed her, but fled after she screamed and kicked at him. Library staff called police, telling investigators they had seen the suspect in the library before, but were not aware of similar incidents.

Police described the suspect as black with a medium complexion, standing between 5 ft. 7 in. and 5 ft. 10 in. tall, and weighing between 160 and 180 lbs. He had a shaved head, brown eyes, a gap in his front teeth and a scar on his forehead, according to police.

The man wore a pale, long-sleeved button-up shirt and khaki pants at the time of the incident, police said, and carried a brown or tan leather briefcase.

Anyone with information is asked to call Fairfax County Police at 703-691-2131. They can also call Crime Solversat 1-866-411-TIPS/8477, reach them online, or text “TIP187” and a message to CRIMES/274637.