Authorities say the 32-year-old victim was walking down the stairwell to the 1 train at 86th Street and Broadway just after midnight when a man pushed her up against the wall and groped her.
She managed to fight him off and call the police, but he had already fled.
The investigation is ongoing, and anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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