Fond du Lac police are investigating a bank robbery. Police were called to the Associated Bank on South Main Street shortly after 3:30pm Thursday after receiving a report of a robbery. Assistant police chief Steve Thiry says the suspect gave the teller a note demanding money. No weapon was displayed. Thiry says police are still looking for a suspect. The suspect is described as a white male in his early to mid 40s, between six feet one and six feet two inches tall, and thin build. He was wearing dark frame glasses, a red “coaches corner” long sleeve shirt with a gray hooded sweatshirt underneath, gray or green pants and tennis shoes. Anyone with information is asked to call police.