How Did They Know Building 7 Was Going to Collapse?

'As the dozens of witness accounts below show, many people were warned in advance to evacuate the area surrounding WTC 7, because of the "imminent" collapse. Indeed, a specific "collapse zone" was set up and, consequently, there were no casualties when WTC 7 eventually fell. Furthermore, a small number of senior firefighters have claimed they could tell beforehand that this building was going to come down, even though such an event would have been totally unprecedented.

So how did they know Building 7 was going to collapse?'

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