9/11 cops saw collapse coming
The World Trade Center towers showed telltale signs they were about to collapse several minutes before each crumbled to the ground, scientists probing the Sept. 11, 2001, disaster said yesterday.
In the case of the north tower, police chopper pilots reported seeing the warning signs - an inward bowing of the building facade - at least eight minutes before it collapsed at 10:29 a.m.
Engineers believe the bowing of the exterior steel beams near the flame-engulfed floors was the critical "triggering point" because that's the direction each tower tilted as it came crashing down.
http://www.skyscrapersafety.org/html/article_20040619.html
The WTC Buildings are Leaning and Buckling
• At 9:30 am, a FDNY Chief Officer inside WTC 1 feels the building move and makes the decision that the building is no longer safe.
• At 9:49 am, NYPD helicopters provide a radio report stating that “large pieces” are falling from WTC 2.
• At 10:07 am, NYPD aviation units warn that WTC 1 may collapse.
• At 10:20 am, NYPD aviation unit reports that
WTC 1 is leaning to the south.
http://www.representativepress.org/BowingDebunksExplosives2.html