One firefighter was killed and 9-others were injured in an explosion at Calumet County manufacturing plant. The victim was a 33-year old volunteer firefighter. Calumet County Sheriff Gerald Pagel says one of his deputies spotted the fire at Bremer Manufacturing, a foundry near the unincorporated community of St. Anna, at about 7:30 p.m. Tuesday. Pagel said the St. Anna fire department responded and was fighting the fire when the explosion occurred. One other firefighter is reported in critical condition at Theda Clark Medical Center in Neenah. Five other firefighters were treated at a Chilton hospital, for non-life threatening injuries. There were no employees in the plant at the time of the fire. St. Anna is located about 25 miles northwest of Sheboygan.