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Three planes crashed into prominent buildings in the United States on September 11, 2001, killing nearly 3,000 people. According to the official report, two planes struck the twin towers of the World Trade Center, which collapsed after the intense fires caused structural failures. However, some theorists argue the towers showed signs of a controlled demolition, as their collapses resembled buildings intentionally imploded. The document outlines some key facts about the planes and buildings involved, and discusses both the official story of the towers collapsing due to fire damage as well as alternative theories that explosives may have been involved.Read less