Toen het Winstor building in Madrid in brand stond hoorde men ook vele explosies !
http://newsfromrussia.com/accidents/.../13/58231.html
Voor ervaren brandweerlieden zijn explosies bij grote branden een normaal fenomeen:
In the towers there were partial floor collapses, falling elevators, likely debris falling down elevator shafts, fuel vapors igniting, bursting pipes, and perhaps steel failing, electrical systems shorting, and pressurized containers from the buildings and aircraft exploding. None of these things would be surprising during such events. As veteran firefighters said,