wasn't there a subway under that building and the wtc? or underground stores or something?
also could the vibration from the two building falling contributed to that?
or maybe bomb we're install inside the building days before
No. The only attempted reason so far is "asymmetrical fires in parts of it caused it to fall symmetrically".
I'll attach a pic of it. It's a 47 story building that converts itself to powder in 7 seconds.
Vaporized. All 47 of the floors lose structural integrity at once, and the two central columns implode too.
it's been almost 6 years, and the white house/NIST keep putting off the WTC7 report.
it is the smoking gun of 9/11. you don't have to look at any other building. There was no subway, they admit the fuel tank never broke. hell, most of the windows were still intact.
The building was vaporized. Here is a 8-second google clip of the collapse. it is a controlled demolition.
BACK VIEW:
http://video.google.com/videoplay?docid=8403741864603265979&q=wtc+7+new&hl=enFRONT VIEW:
http://video.google.com/videoplay?docid=3132857754400064872&q=wtc7+collapse+new&hl=en