A 45-year-old man was shoved onto the tracks in a Bronx subway station in an unprovoked attack Wednesday morning, authorities said. 

The victim was standing on the southbound 1 train platform at the 231st Street station in Kingsbridge at around 7:30 a.m. when his attacker came up behind him and suddenly pushed him onto the tracks without warning, cops said. 

He was taken to North Central Bronx Hospital with a broken leg, police said.

The suspect, who appeared to be around 35 years old and wearing all black, fled after the attack. 

The victim was not struck by a train, and it was unclear whether one was oncoming at the time.

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