Original sentence: The 9/11 Truth Movement is the name adopted by the loosely-connected organizations and individuals that question the mainstream account of the September 11, 2001 attacks against the United States.The common proposition among all of the movement supporters is that the "official account" (movement supporters mischaracterize the mainstream account as having some sort of official status) of the events of 9/11 is not true, and that the truth has been covered up by high-level officials and the official investigators.The movement has attracted enough attention to result in refutations published in mainstream-media sources
Edited sentence: The 9/11 Truth Movement is the name adopted by the loosely-connected organizations and individuals that question the official account of the September 11, 2001 attacks against the United States.The common proposition among all of the movement supporters is that the official account of the events of 9/11 is not true, and that the truth has been covered up by high-level officials and the official investigators.The movement has attracted enough attention to result in refutations published in mainstream-media sources, though movement supporters deny that their claims have been debunked.There is also controversy over whether the claims of the movement should be considered a conspiracy theory