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OLINVILLE, the Bronx — A woman seriously injured a man when she stabbed him in the back on the staircase of a Bronx subway station on Wednesday evening, police said.

The victim had been fighting with and was on top of another man at the Gun Hill Road station around 5:40 p.m., officials said. Then the woman came up and stabbed the man in the back.

The victim was taken to NYC Health + Hospitals/Jacobi Hospital in serious condition, police said. He is not likely to die.

No arrests have been made.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting http://www.nypdcrimestoppers.com, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).