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In this picture, just to the right and above the fireman on the right is a garbage truck that may be the one that was initially thought to have exploded by some people. I don't know what happened. It is possible that one wing struck the ground, broke off and followed the fuselage into the building. That would account for the smaller impact area than the article author belives necessary.
Also in this picture is evidence of damage to the building on the left where a portion of the wing may have struck it.
sarcasm/ However that still does not explain the lack of pigeon manure on the window sills does it ? /sarcasm
The object above the firemen is the remains of a 40' diesel generator that powered certain outside needs for the flight control tower that is to the far left and behind the red fire truck. There was a diesel fuel tank there that did cause a secondary explosion when the fuel finally lit off. There's speculation that one of the aircraft's engines impacted the trailer before striking the building, but I don't know if that was confirmed or not.