A 45-year-old Windham man was arrested Sunday by Portland police less than two hours after he allegedly robbed a supermarket on Auburn Street in the Northgate shopping center.

Joshua Nelson was arrested about 11:32 p.m. near the intersection of Congress Street and Valley street after police pulled over his vehicle. His vehicle matched the description of a car seen leaving the scene of a robbery at the Shaw’s supermarket in the Northgate shopping complex about 9:42 p.m.

Police believe Nelson entered the store and demanded money, saying he had a gun. No weapon was displayed, and a cashier handed over the register’s drawer with an unknown amount of money inside.

Nelson was arrested without incident, and no weapon was recovered.

Police are looking into whether Nelson is responsible for other robberies in South Portland, Scarborough, Westbrook, and Falmouth that occurred over the weekend.