District police are looking for a suspect accused of knocking a woman out at a Metrorail station on the night of Halloween.
The victim, whom the Metropolitan Police Department did not identify, was exiting a train at Archives-Navy Memorial-Penn Quarter station with her friends at about 12:25 a.m. Saturday when another group approached.
The second group mocked the costumes worn by the victim and her friends, then one of the approaching people attacked, police said…