September 11 Attacks
On September 11, 2001, 19 al-Qaeda operatives hijacked four U.S. airliners and carried out coordinated suicide attacks, striking the World Trade Center in Lower Manhattan and the Pentagon in Arlington County, Virginia, with a fourth plane crashing in rural Pennsylvania during a passenger revolt. The attacks killed 2,996 people (including the 19 hijackers), destroyed the Twin Towers and damaged the Pentagon, and produced enormous civilian and first-responder casualties and long-term health effects from toxic debris. U.S. intelligence quickly attributed the plot to al-Qaeda leadership under Osama bin Laden, prompting the U.S. to launch the global war on terror and later invade Afghanistan; key documentary and forensic evidence (hijackers' documents, flight data, intercepted communications) tied the operatives and planners to al-Qaeda. Many principal plotters were identified, some detained, but full criminal resolution of high-level planners remains unresolved.
New York City
