No one was injured in the robbery, police said.
The robbery took place at 11:55 a.m. Monday at the TD Bank on Route 100 by a suspect dressed in dark clothing and wearing a mask and hood, according to police.
The robber was armed with a firearm and demanded money from the bank tellers, police said. The suspect then fled on foot with an undisclosed amount of cash.
The robber was last seen fleeing on foot on Route 100, heading north from the bank, according to police.
Police described the suspect as about 5 feet 10 inches to 5 feet 11 inches tall, and weighing about 180 pounds.
Anyone with information is asked to call state police in Middlesex at 229-9191.
