The incident was reported around 4 p.m. on the L train platform.
Officials say the 45-year-old victim was slashed with what appeared to be a pocketknife after a verbal argument with the suspect escalated on the platform.
The victim was taken to Bellevue hospital where he is said to be stable. He was conscious and alert.
L trains were held for a period of time but service has since resumed regular stops with delays between Bedford and 8th avenues.
Few other details were released.
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