CONEY ISLAND, Brooklyn (PIX11) – A 71-year-old New York City subway cleaner was injured when she was punched in the face while working, police said.

The assault happened at the Stillwell Avenue-Coney Island subway station on July 13 at 3:30 p.m., according to the NYPD.

The subway cleaner, who was contracted by the MTA from an outside agency, was on the northbound F line platform at the station when a woman came up to her and — unprovoked — punched her in the face, police said. The victim received treatment at the scene.

The suspect fled onto a northbound F train. Police described her as about 40 years old, 5-foot-1 and around 110 pounds with short, dark-colored hair. She was last seen wearing a pink-colored t-shirt with the word “hope,” dark-colored pants, and black sandals.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting crimestoppers.nypdonline.org, downloading the NYPD Crime Stoppers mobile app, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).