Almost all the occupants of the North Tower who are able to evacuate the building have done so. Only 107 occupants who were below the impact floors remain in the building, while around 7,400 have escaped. However, 1,355 building occupants in or above the impact zone have either already died or perish in the collapse, as do many emergency workers. Overall, 99 percent of building occupants below the impact floors escape to safety. [National Institute of Standards and Technology, 9/2005, pp. xxxviii, 32] Most workers in the South Tower also left the building before it collapsed (see 9:58 a.m. September 11, 2001).
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