September 11 fire investigation

It was in the morning of September 11 2001, when two Boeings 767 hit the each tower of the World Trade Centre leading to their collapse despite the assurances that had been given about the strengths of the buildings. The fire department did investigation in their quest to ascertain the cause of the collapsing of the building. During construction, the impact of one Boeing 707 had been analyzed but to their surprise the first time it was hit, there were two planes. It is worthy noting that

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