The Capital One Bank in Dunkirk, Md. was robbed Tuesday morning.
The Calvert County Sheriffs Office says the suspect didn't show a weapon. He fled on foot or possibly in white SUV.
Police are looking for a black male wearing a dark blue jumpsuit and sunglasses.
Northbound Route 4 was shut down for a period of time while police searched the area for the suspect.
Police ask that anyone who sees someone matching this description contact 410-535-2800.