The Today Show reports that investigators think the China Airlines 737 that dramatically exploded on the runway last week may have been caused by a loose bolt. The bolt may have slipped from its washer on one of the slats used to slow the plane on landing, shot into the engine, puncturing the fuel tank and causing fuel to spray and ignite.

Airlines worldwide are urged to check the nut and bolt assemblies on 737 series 600 through 900. Stateside, these planes are flown by Continental, Southwest, Delta, American, and Alaska Airlines.

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