Have you ever seen a tank or should I say depot of propane tanks blow up? If not than I would say that you had better do some studying. The propane alone would have sent the nails flying in all directions doing some potentially critical injuries. And you are right in saying that the petrol would have made a real nasty firebomb.
E/A bombs are difficult to make and these idiots weren't even close.
Owl_Eagle
If what I just wrote made you sad or angry,
it was probably just a joke.