Police responded to the scene just after 8 p.m. Friday after a straphanger told them a man was on fire.
The victim, a 67-year-old homeless man, was taken to New York-Presbyterian Weill Cornell Medical Center in critical condition.
He suffered burn injuries to his legs and upper body.
The cause of the fire is under investigation with police working to determine if the fire was started by the victim or someone else.
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