http://ping.fm/cpSZR Videos Show Building 7's Vertical Collapse

10:50 a.m.: Five stories of the Pentagon collapse due to the fire.

10:45 a.m.: All federal office buildings in Washington D. C. are evacuated.

10:32 a.m.: Cheney called Bush on Air Force One to say they had just received a threat against the plane

10:28:31 a.m.: The North Tower of the World Trade Center collapses

10:10 a.m.: The FAA orders all planes to land at nearest airports.

10:06:05 a.m.: According to seismic data, United Airlines Flight 93 crashes near Shanksville, Pennsylvania, in Somerset county