At 7am 2 torches were lit to help heat belts. One torch was turned off at 9:00am, but the other was left burning. At 5pm the employee in the area shut down the plant and left. The torch was left on, and the belt started on fire. The fire was noticed by a mechanic on site at 6:15, and the fire department was notified. The fire was extinguished around 7pm.