Police are investigating a Sunday armed robbery at the 7-Eleven at 14410 Minnieville Road in Dale City.
A masked gunman walked into the store about 2:55 a.m., brandished a gun and demanded money.
After taking an undisclosed amount of money, the suspect fled the scene on foot. No injuries were reported, police said.
The robber was last seen wearing a black face mask, a black hooded sweatshirt with white strings and a white t-shirt underneath, white socks covering his hands, black pants with three white stripes on the side of the leg and black shoes.
Anyone with information is asked to call Prince William County police at 703-792-6500.