Two people were treated for minor injuries in a fire at Rosenow Elementary School in Fond du lac . Division Chief of Fire Prevention Troy Haase says firefighters responded at about 11am Thursday for a report of a fire in the boiler room at Rosenow. Haase says there were two people working on the boiler when the fire started. “They said that a hose on the settling tank ruptured and caught fire,” Haase told WFDL news. Haase say firefighters quickly extinguished the fire.