8:46 amFirst 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.
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