Group of 14 Survivors Located in Ruins of North Tower’s Stairwell B

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U.S. Airspace Closed

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New York City Mayor Orders Evacuation of Lower Manhattan

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Collapse of the North Tower

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Collapse of the Pentagon E Ring

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Crash of Flight 93

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Continuity of Government Procedures

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Collapse of the South Tower

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9-1-1 Call from Flight 93

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Washington, D.C., Evacuations

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