VIDEO: Fond du Lac firefighters battled they called a "major fire" at an historic building in the city early Tuesday. The scene is at the former Northern Casket Company building at 16 N. Brooke St. The building is listed as an historic property on the Wisconsin Historical Society website. The Fond du Lac Fire Department says Brooke St is closed between Division and Western. Video posted on the Fond du Lac Fire/Rescue Facebook page shows flames engulfing the building, which dates back to 1919. Fond du Lac Fire/Rescue Chief Peter O'Leary says a police officer on patrol noticed smoke at about 2:45 a.m. and found fire at the rear of the building. At one point, a water main broke and caused supply issues for the firefighters. The cause of the fire is under investigation. The fire department says the building is abandoned.