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.