He's described as black, about 6' tall with a muscular build. He wore dark sunglasses, a black hoodie, blue jeans and black boots.
The subject produced a firearm and demanded money from the bank's teller. After collecting the money, the subject fled on foot down River Street. The hooded sweatshirt had a small unknown emblem at the base of the neck.
Drop a dime to Special Agent Aaron McFarlane at 617-851-6129.