A 23-year-old woman told police that a man with a knife sexually assaulted her and attempted to rob her in Fairfax County, officials said.

The incident took place at about 8:30 p.m. Sunday in the 7700 block of Richmond Highway, after the woman got a cup of coffee from a Starbucks.

The woman told police that she was at her car when a man approached her, displayed a knife and demanded money. The man then sexually assaulted her, and she screamed. A Fairfax County police spokeswoman said that she could not say how the woman was sexually assaulted.

The man fled after the attack. He is described as Hispanic, about 5 feet 7 inches tall, in his late 30s, with a thin build and a narrow face. He was wearing a blue baseball cap and a light blue hoodie.

Anyone with information can call Crime Solvers at 866-411-TIPS (8477).