More updates:

Three reported explosions in Washington, D.C.: The Pentagon, the State Building and the Capitol Building. The Pentagon explosion is b/c of the plane crash, the State Bldg is b/c of a car bomb. Haven't heard any details on the Capitol Bldg.

A plane reportedly crashed into Camp David; haven't heard any confirmation on that.

Lower Manhattan and the governmental areas of D.C. are being evacuated, and reportedly all national landmarks are also being shut down. Canada has likewise shut down its international air traffic.

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