A Minneapolis man who authorities say is responsible for a string of bank robberies in Minnesota, including in St. Peter, Gaylord and Cologne, has pleaded not guilty to 13 counts of armed bank robbery. 49-year-old Mark Wetsch entered his plea Thursday in US District Court in St. Paul. He had been dubbed the “Man In Black” for the dark clothing authorities say he wore during his robberies. Wetsch was arrested outside of St. Peter in January after a bank robbery in Brewster. He allegedly alluded to other bank robberies at the time. Wetsch reportedly told authorities he used a toy gun because he didn’t want to hurt anyone. He remains in custody.