- The presence of "secret" offices in the building, ranging from the secure HQ of New York's mayor to a US intelligence station to the offices of the authority which investigates sensitive cases of failure of Wall Street companies (and, consequently, the presence of related documents destroyed in the collapse of the building).
He took an interesting photograph which shows the South Tower as it begins to tilt and then collapse, forming a cloud of dust which engulfs the city and the river.
This is followed by a series of dramatic pictures which document the expansion of the cloud of dust that swallows Manhattan.
The North Tower has collapsed and WTC7 is on fire, as indicated by the huge cloud of smoke which is spewing out of its south face.
.I cropped this photograph to enlarge the details of the south face of WTC7:
A comparison of the photographs taken during the collapse (left) and after (right) allows to assess the extent of this damage.
Personally, I felt it would be useful to present this small piece of research I carried out some time ago to demonstrate tangibly that any attempt to reconstruct the events is worthless if it does not analyze carefully the available material and cross-checks it with eyewitness reports, always pointing out the consistencies and inconsistencies of each theory.
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