Officials say two passengers got into an argument by the 4/5/6 line at Grand Central, which led to one striking the other in the head with a padlock.
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First responders put the victim on a stretcher into an ambulance and rushed the victim to the hospital.
There is no word if police placed anyone under arrest.
This attack is the latest in a series of violent attacks. On Sunday morning, officers arrested a man in a string of deadly attacks on the A train.
Subway stabbing suspect had knife on him when he was arrested
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