According to police, a man was slashed in the face with a knife on a 6 train on Lexington Avenue and East 96th Street just before 9 a.m.
The victim was taken to Mt. Sinai Hospital. He is expected to survive.
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Police say it's too early to tell what the motive was for the attack or if any words were exchanged.
The suspect is described as a man in his 30s.
He was seen wearing a black coat, gray sweatpants and a multicolored turban.
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Officials say the suspect was last seen running southbound on the train tracks.
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