Watch the video at this link:
Body in car is identified Video shows accident site. Video says Bureau of Alcohol, Tobacco and Firearms has now joined the FBI investigation.
There was little collision damage, and the fuel tank AND engine were not the sources of the fire.
Local news here in Nashville is now reporting that gasoline was found on the deceased body and remnants of clothing, and also witnesses are saying that they saw the car on fire before it crashed. The body was so badly burned that there were no arms or legs attached to the torso when found.