NEW YORK (CBSNewYork) — Police were searching Thursday for a man who punched a woman on a subway train in Brooklyn without provocation.

Around 6:05 pm. Monday, Nov. 23, the 29-year-pld woman was on an inbound A Train approaching the Jay Street-MetroTech station, when the man approached her and punched her in the head with a closed fist, police said.

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The suspect ran off afterward, police said.

The victim suffered pain and swelling to her head, but refused medical attention at the scene, police said.

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The suspect was described as a black male in his 50s, standing about 5 feet 11 inches tall and weighing about 230 pounds, with short, close-cut brown hair and brown eyes. He was last seen wearing a brown jacket with a black shirt underneath, a gray hoody sweater, blue jeans, and black sneakers.

Police have released surveillance photos of the suspect.

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Anyone with information was asked to call the NYPD Crime Stoppers at (800) 577-TIPS, log onto the Crime Stoppers website, or text tips to 274637 (CRIMES) and enter TIP577.