Police are asking for the public’s help in tracking down a man accused of attacking a fellow subway rider on board the 4 train.

Police say it happened on a southbound 4 train as it pulled into the station at Utica Avenue.

The attack happened on Tuesday, April 30 around 1 a.m.

Investigators say he went up to a 25-year-old man and started yelling, "I’m bigger than you and I can beat you up.”

Police say he then punched the victim twice in the face before running off the train and out of the station. The victim was treated at the hospital for a broken jaw.

The suspect is described as between 30 and 35 years old, about 6 feet, 1 inch and around 200 pounds.

Investigators say he had freckles, facial hair and was wearing a red and yellow jacket with the letter 'R' on the front.

Anyone with information is asked to call police.