Slideshow: A Nation Reacts

Authorities went on alert from coast to coast Tuesday, halting all air traffic, evacuating high-profile buildings and tightening security at strategic facilities following the attacks on the World Trade Center and the Pentagon.
AM New York

November 23, 2008

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A pair of unidentified FBI agents stand guard at an entrance to the Federal Building, center-rear, in the Westwood district of Los Angeles, Tuesday, Sept. 11, 2001.
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A pair of unidentified FBI agents stand guard at an entrance to the Federal Building, center-rear, in the Westwood district of Los Angeles, Tuesday, Sept. 11, 2001. (AP Photo)

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