Following an explosion and fire that rocked a pressed board manufacturing plant the day before (ARIA 20578), firemen opened a silo to extinguish burning wood chips. When firefighters opened the silo to pour water on the flames, the sudden infusion of oxygen caused the second blast. One firefighter was seriously burned and 5 were treated for smoke inhalation. The plant, whose activity was interrupted after the first accident, remained closed until the investigation of the first blast was complete, idling the 230 workers employed at the plant.