Maryland State Police in Hagerstown are continuing to investigate a robbery that occured at the Sheetz store located at Huyetts Crossroad. Authorities said it happened on June 20th, when a white man entered the establishment, took out a knife and demanded money from the cashier before fleeing in a dark colored Ford Explorer. The suspect is described as being around 30 years of age, about five-feet-seven inches tall, and weighing 160 pounds. Police said when he robbed the store he was wearing a white ball cap, a gray shirt and blue jean shorts.