The 9/11 truth movement encompasses a disparate group of adherents to a set of overlapping conspiracy theories that dispute the general consensus of the September 11 attacks that a group of Al-Qaeda terrorists had hijacked four airliners and crashed them into the Pentagon and the original World Trade Center Twin Towers, which consequently collapsed. The primary focus is on missed information that adherents allege is not adequately explained in the official National Institute of Standards and Technology (NIST) reports, such as the collapse of 7 World Trade Center. They suggest a cover-up and, at the least, complicity by insiders. They analyze evidence from the attacks, discuss different theories about how the attacks happened and call for a new investigation into the attacks. Some of the organizations assert that there is evidence that individuals within the United States government may have been either responsible for or knowingly complicit in the September 11 attacks. Motives suggested by the movement include the use of the attacks as a pretext to fight wars in Iraq and Afghanistan and to create opportunities to curtail American civil liberties. Support for the movement is negligible from professionals in relevant fields, such as civil and aerospace engineering. Source: Wikipedia (en)