Prince William County police are searching for a man they say crept through an unsecured window and sexually assaulted a 38-year-old woman sleeping in her bedroom Wednesday.

Police were called to the 1700 block of River Bend Way around 10 a.m. Wednesday. The suspect is between 25 and 30 years old, between 6-foot and 6-foot-5, with a thin build and short hair. The victim told police that the man had covered his face with a towel.

He was last seen wearing a black tank top, black shorts, white and red shoes, and carrying a small, tan colored towel, police say.

Police urge anyone with information to call Crime Solvers at 703-670-3700 or 1-866-411-TIPS.