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Collapse of the World Trade Center

The collapse of the World Trade Center occurred during the terrorist attacks of September 11, 2001, after each of the Twin Towers was hit by a commercial airliner. One World Trade Center (WTC 1, or the North Tower) was hit at 8:46 a.m. EST. It collapsed at 10:28 a.m. Two World Trade Center (WTC 2, or the South Tower) was hit at 9:03 a.m. It collapsed at 9:59 a.m.

The debris from the collapsed buildings severely damaged or completely destroyed more than a dozen other nearby structures. That led to the collapse of 7 World Trade Center at 5:21 p.m. In the crashes, fires, and subsequent collapses, 2,763 people were killed. They included 2,192 civilians, 343 firefighters, and 71 law enforcement officers. They also included all of the passengers and crew on the airplanes, which included 147 civilians and the 10 hijackers.


Collapse Of The World Trade Center Media

  • Diagram showing floor truss system and concrete floor over steel pans

  • Twin Tower hat truss framing at the roof level

  • Fireball from aviation fuel emerges from north side of WTC 2 immediately after the impact from United Airlines Flight 175. Smoke from earlier fires can be seen coming from north side of WTC 1 at right.

  • WTC 1 "Twin Tower" floor truss system's sprayed-foam fire-resistance insulation material visible on this image of the floor trusswork

  • Impact locations on 1 and 2 WTC showing approximate angle of impact and alignment of the cores with the exterior of each tower.

  • WTC burning on 9/11.

  • Aerial view of the site after the collapse, with locations of the collapsed buildings outlined

  • Layout of debris from the Twin Towers, including the directions in which the outer walls fell.

  • Redistribution of load after aircraft impact. Illustrates various secondary load paths

  • NIST simulation of sagging floor truss. Note buckled webs at right.

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