Police say it happened at the station for the B and Q trains in Flatbush.
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Investigators believe there was a dispute before the stabbing.
Authorities say the victim was taken to Kings County Hospital in stable condition.
Subway riders say police have to do more to protect commuters.
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"I think we got to do better, especially with our security. Where are the thorough pat-downs, where is everybody? Everybody's here after the commotion," one rider said.
Police have not said what the dispute may have been about. The suspect fled the station.
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