An Arizona teenager is fighting for his life after a truck caught on fire and left second and third degree burns on 40 percent of his body, myFOXphoenix reported.  

Firefighters who responded to the blaze said it did not appear the truck was involved in an accident and speculated the fire may have been mechanical.

The victim's name has not been released, and Northwest Fire Department officials told myFOXphoenix it is still unclear why the he did not or could not get out of the vehicle.

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