Source:
http://tangibleinfo.blogspot.com/2008/08/wtc7-collapse-incredible-conclusive.html
Debunking NIST's conclusions about WTC 7 is as easy as shooting fish in a barrel.
 
Symmetrical Collapse
 NIST lamely 
tried to explain the symmetrically collapse as follows:
WTC 7’s collapse, viewed from the exterior (most videos were taken from  the north), did appear to fall almost uniformly as a single unit. This  occurred because the interior failures that took place did not cause the  exterior framing to fail until the final stages of the building  collapse. The interior floor framing and columns collapsed downward and  pulled away from the exterior frame. There were clues that internal  damage was taking place, prior to the downward movement of the exterior  frame, such as when the east penthouse fell downward into the building  and windows broke out on the north face at the ends of the building  core. The symmetric appearance of the downward fall of the WTC 7 was  primarily due to the greater stiffness and strength of its exterior  frame relative to the interior framing.
NIST can't  have it both ways. If the exterior frame was so stiff and strong, then  it should have stopped the collapse, or - at the very least - we would  have seen a bowing effect where tremendous opposing forces were battling  each other for dominance in determining the direction of the fall.
 In  real life, the thick structural beams and "stiff [and strong]" exterior  frame used in the building should have quickly stopped any partial  collapse, unless the support columns were all blown. At the very worst,  we should see a 1 or 2 floor partial collapse.
 
Freefall Speed
 NIST said that WTC 7 fell at 40% slower than freefall speed.   But it collapsed 
alot faster  than it would have if the structural supports were not all blown away  at the same instant. 40% slower isn't very impressive -- that's like  arguing that a rock falling through concrete 40% slower than a rock  falling through the air is perfectly normal.
 Again, why did the  building collapse at all, given that the thick structural beams should  have quickly stopped any partial collapse?
911 wtc 7 new angle
Bomberne der forsvandt 06