Milwaukee fire investigators say it will be awhile before they can determine the cause of the fire that destroyed the building that housed the Pizza Man restaurant on Milwaukee's east side. Meanwhile, the federal Bureau of Alcohol, Tobacco, Firearms and Explosives is sending a National Response Team to help with the investigation. "The purpose for doing so is solely due to the magnitude of the fire, and this type of assistance from ATF is a matter of course," Milwaukee Police Department spokeswoman Anne E.