We discussed this yesterday. Snapped shot has the right idea but their analysis is a bit off. Here is Fadel's body with his car in the background. It's smoldering a bit but it's not on fire. After they remove the body then the car bursts into flames. Notice only the interior of the car iis burning, this isn't a gas fire from leaking fuel. Not even the tires are burning. Then they put out the fire and hose down the scene. I think they set the fire in the car to destroy possible evidence and hosed down the scene for the same reason.