It happened on Tuesday at 4 a.m. on the corner of Fulton Street and Franklin Avenue in Crown Heights.
Police say the 24-year-old woman was approached by a man who slashed her in the back of the head with an unknown object, causing a deep laceration.
The suspect fled northbound on Franklin Avenue.
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The victim was taken to the hospital in stable condition.
The suspect is described as a man with a medium skin tone, approximately 48-50, 5'10" and 180 pounds. He was last seen wearing a black coat, a blue sweatshirt, and blue sweatpants.
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