The man can be seen slapping the woman numerous times from behind and grabbing at her chest.
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It happened back on March 10th around 8 a.m. near Livonia and Rockaway Avenue in Brownsville.
The victim hit him with her umbrella and he eventually ran off.
Police say the woman wasn't injured, but the suspect is still on the loose.
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The suspect is described as having a goatee and was last seen wearing black pants, black Nike sneakers, a black hooded jacket with a multi-colored design on the back.
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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