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In New York City, the South Tower of the World Trade Center collapsed in 10 seconds, followed by the North Tower 29 minutes later. Later that evening, World Trade Center 7, a 47-story office building, also collapsed in 6 seconds. The official explanation was that falling debris from the twin towers caused a fire inside the building. However, this would make it the third building in history to collapse due to fire. Other buildings, like the Empire State Building, have survived similar incidents without collapsing. Similarly, a skyscraper in Los Angeles burned for 3 hours and a building in Philadelphia burned for over 19 hours, but neither collapsed.