A man sexually assaulted a woman in Fairfax County Saturday after apparently breaking through a locked door, county police said.

They said it happened in a neighborhood just east of Dulles International Airport, near Sully Road and the Dulles Toll Road.

They said a woman in her 20s woke about 5:30 a.m. to find a man in her bedroom, He displayed a weapon and attacked her, police said. They said she did not require medical treatment.

Police said the suspect was described as 6 feet to 6 feet 2 inches tall with a heavy build and light complexion, and of an unknown race. He reportedly wore a black tank top, khaki cargo shorts and a light-colored cloth wrapped around his head that covered his face.