The Marshalltown Police Department responded to the Casey's General Store located at 1009 Lincoln Way on a report of a robbery. Captain Mike Hanken says the suspect had already fled the scene prior to the police being contacted. He says the suspect is described a white male, 5'7"-5'8", 140-150 lbs dressed all in black. The suspect displayed a black semi-auto pistol during the robbery. The investigation into this incident is continuing. The police department requests that anyone who may have information concerning this incident call the Marshalltown Police Department at 1- 641-754-5725.