Attack or accident

OK I have a question which I thought of yesterday. How much explosive would it take to create the damage to the mosque? It would seem to me that such extensive damage would require a substantial amount of explosives? how was it trucked in, I mean did they unload boxes or something, it would seam that it would take more than what you could carry under your shirt, or in your pockets. Did they have handtrucks like a UPS delivery?...Or, big Or, was the mosque used as an ammo dump? It makes for a big difference if instead of and attack, this was an "accident". Not that it would really matter at this point as this thing is already gaining a life of it's own, and everyone is positioning himself for maximum advantage, but it would be nice to know exactly what happened.