The Green Bay Police Department is investigating a reported armed robbery at a west side sandwhich shop. The incident happened just after 6:00 PM yesterday on the Cousins Subs located on West Mason Street. According to the police, the suspect entered the store, threatened the clerk with a knife, and fled the scene. No one was injured in the incident, and the amount of money that was taken has not been disclosed. Anyone with information on the robbery is encouraged to contact the Green Bay Police Department at (920) 448-3208.