In Portage, police are investigating an armed robbery. At around 8-o'clock Wednesday night, police responded to the MCR Short Stop at the southeast corner of Central Avenue and Hamstrom Road. Authorities say the suspect displayed a semi-automatic pistol and fled in an unknown direction. He was described as a white male, wearing a grey hooded sweatshirt, dark colored jeans and a black mask. Anyone who was passing through the area around the time of the robbery who observed anything suspicious is asked to contact the Portage Police Department at 219-762-3122 and ask for Detective Grynovich.