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Hat truss theory adds to WTC collapse controversy Work continues on WTC7 collapse probe


ANALYSIS OF the baffling collapse of the 47 storey WTC7 tower was not included in the 'final' report into the collapse of the World Trade Center towers published last week.

The original brief given to the National Institute of Standards and Technology (NIST) by the National Construction Safety Team Act in October 2002 included determining why and how all three towers came down.

But while all investigations to date have agreed on the prime causes of the Twin Towers collapse, the cause of the WTC7 failure is still far from clear.

Blazing debris from the collapsing twin towers ignited fires throughout WTC7. It burned for seven hours before collapsing catastrophically.

NIST lead investigator Shyam Sunder said last week that it was hoped the first draft report on WTC7 would be out 'before the end of the year'.

He admitted that NIST still had a lot of work to do to clarify the exact mechanism of the collapse, but said the team was still convinced that a leaking standby generator fuel pipe was the major factor in the disaster (NCE 9 May 2002).

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