The 9/11 Commission Report

The 9/11 Commission Report, formally named Final Report of the National Commission on Terrorist Attacks Upon the United States, is the official report of the events leading up to the September 11, 2001 terrorist attacks. It was prepared by the National Commission on Terrorist Attacks Upon the United States (informally sometimes known as the "9/11 Commission" or the "Kean/Hamilton Commission") at the request of United States president George W. Bush and Congress, and is available to the public for sale or free download.
The commission was established on November 27, 2002 (442 days after the attack) and their final report was issued on July 22, 2004. The report was originally scheduled for release on May 27, 2004, but a compromise agreed to by Speaker of the House Dennis Hastert allowed a sixty-day extension through July 26.