The incident happened around 11:40 p.m. on June 12 on the northbound No. 6 train platform at the Hunts Point Avenue subway station.
According to the NYPD, the suspect approached the 36-year-old man and snatched a chain from his neck before fleeing the station.
Police say the victim suffered a laceration to his neck, but refused medical treatment.
Anyone with information about the robbery is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477).
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