BROOKLYN - Cops are asking for help finding a teenage girl behind a subway station attack in Bensonhurst. 

Investigators released a photo of a 16-year-old  who they say hit another teen girl in the face and pulled a knife on her before running away. 

It happened at the 79th Street subway stop back in November. 

The suspect is about 5 feet 4 inches tall and 150 pounds. Anyone with information should call Crime Stoppers at 1-800-577-TIPS