A man police arrested for brutally attacking two people in a Midtown subway last week, breaking a victim’s jaw in the process, was all smiles as he was led away in cuffs Wednesday.

NYPD sources said detectives had tracked 26-year-old Jermaine Finley down to a homeless shelter in the Bronx on Wednesday after they had been hunting him for two unprovoked assaults.

According to law enforcement sources, Finely allegedly attacked two men in separate incidents on Sept. 1. Cops say a 36-year-old man was riding a 4 train at around 4:30 p.m. As the train pulled into the Lexington Avenue-59th Street station and the doors opened, detectives allege that Finley punched the straphanger before fleeing.

The victim was left with pain and swelling in his eye but refused medical attention.

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