Fond du Lac Fire/Rescue says a home in Fond du Lac has sustained substantial damage after an early morning fire on Saturday. Firefighters say around 2:54 a.m., they responded to the report of fire showing on the back of a house located at 222 W. Arndt St. Multiple firefighters from surrounding communities helped extinguished the fire, but not before the house experienced substantial damage. The fire is currently under investigation and there were no injuries reported.