BEAVER DAM, Wis. (AP) -- Agents from the federal Bureau of Alcohol, Tobacco and Firearms are helping local law enforcement agencies investigate a fatal explosion at an apartment building in Beaver Dam.
Police Chief John Kreuziger says the explosion Monday afternoon "had an unknown chemical origin." The blast killed one man and blew out the windows of one apartment in the Village Glen complex. Tenants of other buildings in the complex were evacuated, but allowed to return Tuesday.
Kreuziger says residents who live in the building where the explosion occurred could be out a couple days.