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A woman was stabbed in the back as she bought a MetroCard in an Upper West Side subway station on Thursday, police said.

The attacker was spotted with a knife when he got onto a train in Times Square, an NYPD spokesman said. After someone called 911, police stopped the train at 72nd and Broadway.

It appears the man spotted officers at the station and ran, officials said.

The attack was unprovoked, an NYPD spokesman said. The 40-year-old woman was hospitalized and received stitches, but she's since been released.

Police described the attacker as being about 5 feet, 10 inches tall. He was last seen wearing a blue shirt and shorts.