9-11
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9/11 refers to the terrorist attacks that took place on September 11, 2001, in the United States. Four coordinated hijackings by the Islamic extremist group al-Qaeda resulted in the destruction of the World Trade Center in New York City and damaged the Pentagon in Arlington, Virginia. These attacks claimed the lives of nearly 3,000 people. 9/11 is considered a significant event in modern history and had profound impacts on global politics, security measures, and anti-terrorism efforts.