The NYPD released surveillance images of the incident on Nov. 29 on the southbound "R" train platform at the 14 Street-Union Square subway station.
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Police say the suspect approached the 18-year-old female victim from behind and touched her over her pants.
The man then ran from that platform and fled the station on a northbound "4" or "5" train.
The NYPD described him as bald, with eye glasses; last seen wearing a black jacket, a blue shirt, beige pants, light colored shoes, and he had on a dark colored backpack.
Anyone with information about the suspect is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
Tips can also be submitted by visiting the CrimeStoppers website or Twitter @NYPDTips.
All calls are kept confidential.
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