The 9/11 commission credits FAA National Operations Manager Ben Sliney with issuing the directive after he witnessed United Airlines Flight 175 crash into the south tower of the World Trade Center.
When the North Tower was struck by Flight 11, Praimnath started to evacuate from his 81st floor office in the South Tower, but returned when the building's security guards told everyone that the South Tower was secure, and that they should return to their office.
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