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8:46 amvFirst plane hits the North Tower of the WTC. Within Minutes officials coordinate the city wide emergency response. Housing the command center was the 23rd floor of WTC Building 7.
9:00 amBuilding 7 was evacuted from the inside. No one knows who issued that evacuation.
10:28 amNorth building collapses. Falling debris ignites fires in the neighboring towers WTC 4,5,6 and 7. Building 7 burns for 7 hours before collapsing.
NoonFloors 7-9 and 11-13 burned out of control. One issue with this building was that the sprinkler system required manual initiation of the electrical fire pumps, rather than being a fully automatic system. This caused a huge hinder, due to the water pressure, in extinguishing the fires. During this time the firefighters heard creaking sounds coming from inside of the building.
2:00 pmFirefighters noticed an unstableness in the building (a bulge in the southwest corner) raising a red flag that the building might collapse.
3:30 pmFDNY Chief Daniel Nigro made the decision to evacuate the surrounding area.
5:20 pmvWTC Building 7 collapses destroying the city's emergency nerve system.
May 2002FEMA issued a report based on their investigation resulting in the idea that the building was weakened by the fires caused by the debris that WTC 1 and 2 helped ignite; the fire was not extinguished or controlled due to the water pressure and lack of working water sprinklers. The fire burned hot enough and long enough to cause the building to weaken and collapse. The report was simply not good enough and was discarded and further investigation was needed. That same year National Institute of Standards and Technology (NIST) came to the conclusion that the result of the collapse was simply the engineering. That was discarded as well.