9/11 Truth movement are conspiracy theorists who dispute the mainstream account of the September 11 attacks of 2001 . The group disputes the commonly accepted account that Al-Qaeda terrorists hijacked four airliners , crashed them into the Pentagon and New York 's Twin Towers , whereupon the crashes led to the collapse of the Twin Towers . The primary focus is on missed information that they allege is not adequately explained in the official NIST theory , such as the collapse of World Trade Center 7 . They suggest a cover-up and , at the least , complicity by insiders
September 11 attacks
September 11 attacks
9/11 Truth movement