Tires. Powered rubber is extremely flammable. As the tires cooked, they sprayed loose powdered rubber directly behind the tires and the incredible heat being generated directly in front of the powder ignited it. That's why they rolled the car forward, to get it away from a rather large ignition source.
Once it all goes up, the entire tire can catch on fire. Aside from ruined tires and terrorized paint, the engine itself is probably only a little worse for the wear.
Although a non-moving car is not ideal for airflow over the radiator, it's very unlikely that the engine overheated in that short span of time..
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