For those familiar with diesel powered school buses. On Tuesday near Oakland,Iowa, a school bus caught fire and the driver and only passenger perished. The bus interior was gutted, but the tires did not burn. Appears bus backed into a gully trying to turn around in a rural farm yard. My question is where did enough fuel come from so rapidly that a 74 year old man and a 16 year old girl couldn't get out of the bus? This whole incident probably occurred in less than sixty seconds from the girl getting on the bus and the rear of the bus overhanging a ditch. NTSB is investigating. Seems like this kind of a tragedy always happens during the holiday season.