Police released photos of the man they say is responsible for firing shots inside the East 170th Street subway station Monday.
It happened on the southbound "B/D" platform just after 7 p.m., according to the NYPD.
The shooter ran from the scene, traveling northbound on Grand Concourse. He was last seen wearing all black.
Police say a shell casing was recovered. No one was hurt.
The NYPD asks anyone with information to call its Crime Stoppers Hotline at 1-800-577-TIPS (8477).