It probably was the insulation underneath the exterior cladding that caused the building to go up like a roman candle. Unbelievable! You mean to tell us that the engineers who designed this type of cladding and the company who installed it, were not privy to what could happen when fire hit that insulation with all the air available to feed the fire on the exterior? What a horrible design! Similar to the fire in Dubai that also lit that skyscraper apartment building up as well. Very sad!