The official report of the events leading up to the September 11, 2001 attacks. It was prepared by the National Commission on Terrorist Attacks Upon the United States.The commission interviewed over 1,200 people in 10 countries and reviewed over two and a half million pages of documents, including some closely guarded classified national security documents.The commission also concluded 15 of the 19 hijackers who carried out the attacks were from Saudi Arabia, but found no evidence the government of Saudi Arabia conspired in the attacks, or that it funded the attackers.