Police say the attack happened around 8:40 p.m. at West 42nd Street and Seventh Avenue.
They say a man was stabbed in the back. He was taken to a nearby hospital in serious but stable condition.
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The attacker was part of a group of three men who all ran into the nearby Times Square subway station to get away.
Police say the three men were wearing white t-shirts and red pants.
No arrests have been made at this time.
This is breaking news. This story will be updated as more information becomes available.
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