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Damage report

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WTC3 - steel framed 22 storey hotel complex. Took massive debris hits from both towers and was almost totally destroyed. Report describes WTC3's response as 'complex and noteworthy'. Large sections of the building still stood afterwards - there was no progressive collapse and no fire.

WTC4, 5 and 6 - very similar steel framed eight and nine storey office buildings designed by Leslie Robertson. Severe debris impact damage and subsequent fires caused partial collapse. Report commented that fire damage 'closely resembled' that seen during full scale tests at the BRE Cardington test facility in 1995.

Sprinklers seem not to have operated.

WTC7 - see box Bankers Trust Building, 130 Liberty St - 40 storey steel framed office building, took massive debris hit from WTC2 collapse over 15 floors but did not collapse or catch fire. Report recommends 'thorough study' of its robustness.

Seven other structures around the twin towers suffered major damage defined as needing shoring and large debris removal. All damage appears to have been caused by impact of debris from twin towers and WTC7. Best performing structure, according to the report, was the 30 storey Verizon building, which dates from the 1930s.

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