Local emergency personnel responded to a fire at 1010 Parker Drive in Mauston April 3 at approximately 9:15 a.m. The building is used by Brunner Manufacturing. The cause of the fire is unknown at this time. Mauston Fire Chief Kim Hale said there is reason to believe the fire was caused by an "air handling unit," but that may be subject to change as they learn more. Hale emphasized it is still early and more information may become available as efforts continue. Employees were seen evacuating the building and several employees were treated for smoke inhalation. It is unknown whether there were additional injuries at this time.