They said the suspect entered the High's Dairy Store on Jefferson Boulevard just after midnight, and demanded money from the clerk while showing a handgun.
The suspect is described as a black man, about 5'7" to 5'9" and about 120-135 lbs.
He was last seen wearing a red and black striped shirt, jeans and dark colored shoes, with a white bandanna around his head, and a red bandanna around his face.
They said he got away with an undisclosed amount of cash.
Troopers are asking if anyone recognizes this man, or has any information on this incident, call Trooper First Class James Bowers at (301)-766-3841.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.