9/11 Truth movement

Adherents of the 9/11 Truth movement are considered to be conspiracy theorists who dispute the mainstream account of the September 11 attacks of 2001. The "truthers", as they are, sometimes pejoratively, called, dispute 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. Truthers primarily focus on what they claim are significant inconsistencies in that explanation, suggesting a cover-up and, at the least, complicity by insiders.