There are many conspiracy theories that attribute the planning and execution of the September 11 attacks against the United States to parties other than or, in addition to, al-Qaeda, including that there was advance knowledge of the attacks among high-level government officials.
Proponents of these theories assert that there are inconsistencies in the commonly accepted version, or evidence that was either ignored or overlooked..
Government investigations and independent reviews have rejected these theories.
There are many conspiracy theories that attribute the planning and execution of the September 11 attacks against the United States to parties other than or, in addition to, al-Qaeda, including that there was advance knowledge of the attacks among high-level government officials
