The 9/11 Truth movement supports a conspiracy theory that disputes the general consensus of the September 11 attacks in 2001. The theory disputes the consensus that Al-Qaeda terrorists hijacked four airliners, crashed them into the Pentagon and the original World Trade Center Twin Towers, where the crashes led to their collapse. The primary focus is on missed information that adherents allege is not adequately explained in the official NIST report, such as the collapse of 7 World Trade Center. They suggest a cover-up and, at the least, complicity by insiders.