On Nov. 21 at 3:11 p.m., a man entered a business in the 4600 block of Washington Boulevard, went behind the counter while brandishing a firearm, and demanded cash, Arlington police said.
The suspect took cash before fleeing the scene on foot, police said.
Responding officers established a perimeter, broadcast a lookout and searched the area, but yielded no results.
The suspect is described as a tall male with a medium complexion. He was wearing a black mask at the time of the incident.