A Framingham man was arrested on a warrant charging him with assault on a police officer after he was found loitering in front of the MBTA Chinatown Station early today.

Robert O’Regan, 24, is facing charges of assault and battery on a police officer and disorderly conduct, MBTA Transit Police said in a statement.

Transit Police officers arrived at the entrance of the station at about 12:38 a.m. today after reports of a group of people loitering. Several people were blocking the entrance and smoking. Officers approached to disperse them, Transit Police said.

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O’Regan was discovered to have an outstanding warrant from Framingham District Court, and was arrested. He is to appear in that court today.