Comment: I am not saying it was not...

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I am not saying it was not...

I am not saying it was not a missile strike but... It is possible that the down wind heated air was filled with overly rich unburned hydrocarbons. And at a certain point it reached a explosive mixture point and temperature point to self ignite. Any firefighters out there can chime in and better describe a flashover. Here is what Wikipedia says http://en.wikipedia.org/wiki/Flashover

RickStone