It's an ammo dump... where they store explosives.... a large explosion happens and this is a nuclear strike? Nope. The reason it's thought to be one is the light from the small (but larger looking) explosion overloaded the camera since it was shooting in the dark. Most static explosions will have a mushroom cloud from the heat rising. The small jugs of fertilizer and desiel fuel at the Lethbridge Airshow is a good example of this. Not a nuke at all. Too small of an explosion to be one.
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