On September 11, 2001, an Islamic terrorist organization called al-Qaeda committed a devastating and appalling act of terrorism against the United States. There were four different attacks carried out by four passenger airliners that were hijacked. Two of the attacks took place in New York (North and South Towers of the World Trade Center), one at the Pentagon in Arlington, Virginia, and the other occurred in a field in Shanksville, Pennsylvania, which was thought to have been intended at the Capitol or at the White House. These attacks were conducted against a group called al-Qaeda led by Osama bin Laden, who was killed after being captured by the United States. Osama bin Laden's motivation for the attacks is seen in his declaration of holy war against the United States. and a 1998 fatwa signed by bin Laden and others, calling for the killing of an American. In bin Laden's November 2002 “Letter to America,” he explicitly stated that al-Qaeda's motivations for their attacks include; support for “anti-Muslim attacks” in Somalia, support for Russian “anti-Muslim atrocities” in Chechnya, support for Indian “anti-Muslim oppression” in Kashmir, the presence of US troops in Saudi Arabia, support of the United States on Israel, sanctions against Iraq. After the attacks bin Laden and al-Zawahiri released additional video and audio tapes, some of which repeated the reasons for the attacks. Khalid Sheikh Mohammed is the man who masterminded the attacks and first presented them to Osama bin Laden in 1996. In late 1998 bin Laden gave approval to Mohammed to go ahead and begin organizing their plot . In early 1999 a series of meetings occurred involving Mohammed, bin Laden and his deputy Mohammed... halfway through the document... and they were quickly able to identify all the attackers. Shortly after the attack the FBI released the names and the hijackers, described them and on the 27th released real photos of all the men. Khalid Sheikh Mohammed was arrested on March 1, 2003 in Rawalpindi, Pakistan, by Pakistani officials working with the CIA and was then transferred to Guantanamo Bay and interrogated. He is still held there today, interrogated and imprisoned. The FBI never formally charged Bin Laden for the 9/11 attacks (even though they knew he was behind it) but he was instead placed on the FBI's most wanted list for the bombing of the American embassies in Dar e.g. Salaam, Tanzania and Nairobi, Kenya. . After nearly 10 years and the largest investigation in US history, Bin Laden was killed by American special forces at a compound in Abbottabad, Pakistan, last May. 2, 2011.