Police are investigating an armed robbery Saturday at the Dunkin' Donuts at 8525 Rolling Road outside Manassas.
An employee reported that an unknown man followed him inside as he reentered the store through a side door about 9:09 p.m.
Once inside, the robber brandished a firearm and demanded money from the cash registers, Prince William County police Master Officer Renee Carr said. The robber then fled out the side door.
A police K-9 searched the area for the suspect who was not located.
The gunman was Black, about 5 feet 7 with a thin build and last seen wearing a black mask, black hooded sweatshirt with a dark-blue colored shirt over the top, dark colored pants, blue gloves and white shoes.