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9/11 conspiracy theories attribute the planning and execution of the September 11, 2001 attacks against the United States to parties other than, or in addition to, al-Qaeda or claim there was advance knowledge of the attacks among high-level government officials. Government investigations and independent reviews have found no evidence for the theories.〔〔 Proponents of these conspiracy theories claim there are inconsistencies in the official conclusions, or evidence which was either ignored or overlooked. The most prominent conspiracy theory is that the collapse of the Twin Towers and 7 World Trade Center were the result of a controlled demolition rather than structural failure due to impact and fire. Another prominent belief is that the Pentagon was hit by a missile launched by elements from inside the U.S. government〔 or that a commercial airliner was allowed to do so via an effective stand-down of the American military.〔(【引用サイトリンク】title=The Military Drills on 9-11: "Bizarre Coincidence" or Something Else? )〕 Possible motives claimed by conspiracy theorists for such actions include justifying the invasions of Afghanistan and Iraq (even though the U.S. government admitted Iraq was not involved in the attacks)〔(U.S. Drops Last Link of Iraq to 9/11 ) New York Times 2 May 2002〕 to advance their geostrategic interests, such as plans to construct a natural gas pipeline through Afghanistan. Other conspiracy theories revolve around authorities having advance knowledge of the attacks and deliberately ignoring or assisting the attackers.〔〔 The National Institute of Standards and Technology (NIST) and the technology magazine ''Popular Mechanics'' have investigated and rejected the claims made by 9/11 conspiracy theories. The civil engineering community accepts that the impacts of jet aircraft at high speeds in combination with subsequent fires, not controlled demolition, led to the collapse of the Twin Towers. This also was the conclusion of the 9/11 Commission, chaired by Governor Thomas Kean. == Terminology == Within the context of 9/11 conspiracy theories, the terms "mainstream account", "official account" and "official conspiracy theory" all refer to: * The reports from government investigations – the 9/11 Commission Report (which incorporated intelligence information from the earlier FBI investigation (PENTTBOM) and the Joint Inquiry of 2002), and the studies into building performance carried out by the Federal Emergency Management Agency (FEMA) and the National Institute of Standards and Technology (NIST) * Investigations by non-government organizations that support the accepted account – such as those by scientists at Purdue University.〔(【引用サイトリンク】title=Behind Purdue’s computing simulation on the 2001 World Trade Center attack ZDNET June 20, 2007 )〕 * Articles supporting these facts and theories appearing in magazines such as ''Popular Mechanics'', ''Scientific American'', and ''Time''. * Similar articles in news media throughout the world, including ''The Times of India'', the Canadian Broadcasting Corporation (CBC), the BBC, ''Le Monde'',〔(【引用サイトリンク】title=Depuis le 11-Septembre, la menace terroriste est devenue permanente )〕 Deutsche Welle, the Australian Broadcasting Corporation (ABC), and ''The Chosun Ilbo'' of South Korea. * U.S. President Barack Obama's June 2009 speech to the Muslim world where he said "I am aware that some question or justify the events of 9/11. But let us be clear: al-Qaeda killed nearly 3,000 people on that day." These sources concluded that al-Qaeda crashed United Airlines Flight 175 and American Airlines Flight 11 into the twin towers of the World Trade Center, and crashed American Airlines Flight 77 into the Pentagon. The impact and resulting fires caused the collapse of the Twin Towers and the destruction and damage of other buildings in the World Trade Center complex. The Pentagon was severely damaged by the impact of the airliner and the resulting fire. The hijackers also crashed a fourth plane into a field near Shanksville, Pennsylvania after the passengers and flight crew attempted to regain control of the aircraft.〔〔〔(【引用サイトリンク】 The Flight 93 Story )〕 The 9/11 Commission Report concluded that pre-attack warnings of varying detail of the planned attacks against the United States by al-Qaeda were ignored due to a lack of communication between various law enforcement and intelligence personnel. For the lack of interagency communication, the report cited bureaucratic inertia and laws passed in the 1970s to prevent abuses that caused scandals during that era. The report faulted the Clinton and the Bush administrations with "failure of imagination." 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「9/11 conspiracy theories」の詳細全文を読む スポンサード リンク
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