Police say the victim, a 17-year-old boy, was slashed in the left side of his face after getting into a dispute while standing on the southbound platform of the Q train at the 96th Street station.
Police have taken a person of interest into custody.
Charges are pending.
The victim was taken to NewYork-Presbyterian / Weill Cornell Medical Center where he's expected to recover.
This story will be updated as more information becomes available.
----------
* Get Eyewitness News Delivered
* More New York City news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube