Authorities in Watertown arrested a man accused of robbing one business and trying to rob a second last Friday night. According to police 48-year-old Troy Wall was arrested for allegedly robbing Empire Pizza and attempting to rob Sparky’s Bar at knife-point. Sparky’s general manager tells KSFY, customers subdued the suspect and held him until police could arrive and make an arrest. Following Wall’s arrest police executed a search warrant of his home and found Empire Pizza’s cash register and an undisclosed amount of cash. Wall now faces charges including first degree robbery and two counts of aggravated assault.