VICKSBURG, Miss. (May 20)—A rubber dryer may have flashed and caused a dust explosion that started the May 16 fire at Rouse Polymerics International Inc. that killed one worker and seriously injured 10 others, according to Capt. Mark Ettinger of the Vicksburg Fire Dept. "That's not nailed down," Ettinger said, because there are still "hot spots" burning in the building and the department's engineers haven't been able to go in and search for the cause. The "Vicksburg Post" identified the dead worker as Clyde "Teddy" Smith, 40. Rouse Polymerics President Michael Rouse was on the way to Smith's funeral the morning of May 20 and could not be reached for comment.