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.