A woman was sexually assaulted at knifepoint in Northeast Washington last weekend, District police said.

According to police, the victim was walking down the 4900 block of Blaine Street NE Saturday evening, about 10 p.m., when a man with a knife approached her and forced her into an alley, where he assaulted her.

The suspect is described as a black man, about 40 years old, thin build, and last wearing blue jeans and a red hooded sweatshirt.

Anyone with information about the case can call police at 202-727-9099 or 1-888-919-CRIME (1-888-919-2746), or text message 50411.

This item has been updated. Police corrected an earlier news release in which they said the incident took place on Sunday.