The Muskingum county sheriff's office is investigating an armed robbery early this morning. It happened at the Duncan Falls B-P gas station just after midnight. Deputies say the suspect is described as a white male, around 5-feet 9-inches tall and weighing around 150 pounds. The suspect was wearing a gray hooded sweatshirt, blue sweatpants and a black ski mask. Investigators say he entered the store with a shotgun and demanded money. He then fled on foot with an undetermined amount of cash. The sheriff's department is asking anyone who witnessed the incident or has any information to give them a call at 740 452-3637.