In the aftermath of the attacks, tens of thousands of people attempted to flee Afghanistan due to the possibility of a military retaliation by the United States. Pakistan, already home to many Afghan refugees from previous conflicts, closed its border with Afghanistan on September 17, 2001. Approximately one month after the attacks, the United States led a broad coalition of international forces to overthrow the Taliban regime from Afghanistan for their harboring of al-Qaeda. Though Pakistani authorities were initially reluctant to align themselves with the United States against the Taliban, they permitted the coalition access to their military bases, and arrested and handed over to the U.S. over 600 suspected al-Qaeda members.
The failures in intelligence-sharing were attributed to 1995 Justice Department policies limiting intelligence sharing, combined with CIA and NSA reluctance to reveal "sensitive sources and methods" such as tapped phones. Testifying before the 9/11 Commission in April 2004, then-Attorney General John Ashcroft recalled that the "single greatest structural cause for the September 11th problem was the wall that segregated or separated criminal investigators and intelligence agents". Clarke also wrote: "There were failures in the organizations failures to get information to the right place at the right time."
More InfoThe attacks caused the deaths of 2,996 people (including all 19 hijackers) and injured more than 6,000 others. The death toll included 265 on the four planes (from which there were no survivors), 2,606 in the World Trade Center and in the surrounding area, and 125 at the Pentagon. Most of those who perished were civilians, with the exception of 343 firefighters, 72 law enforcement officers, 55 military personnel, and the 19 terrorists who died in the attacks. After New York, New Jersey lost the most state citizens, with the city of Hoboken having the most New Jersey citizens who died in the attacks. More than 90 countries lost citizens in the September 11 attacks; for example, the 67 Britons who died were more than in any other terrorist attack anywhere as of October 2002. The attacks killed about 500 more people than the attack on Pearl Harbor on December 7, 1941, and are the deadliest terrorist attacks in world history.
More InfoBin Laden provided leadership and financial support, and was involved in selecting participants. He initially selected Nawaf al-Hazmi and Khalid al-Mihdhar, both experienced jihadists who had fought in Bosnia. Hazmi and Mihdhar arrived in the United States in mid-January 2000. In early 2000, Hazmi and Mihdhar took flying lessons in San Diego, California, but both spoke little English, performed poorly in flying lessons, and eventually served as secondary – or "muscle" – hijackers.
More InfoThere is some idea that 9/11 was selected by the hijackers as the date of the attack because of its resemblance to 9-1-1, the phone number to report emergencies in the U.S. However, Lawrence Wright wrote that the hijackers chose it because September 11, 1683 is when the King of Poland began the battle that turned back the Muslim armies from the Ottoman Empire that were attempting to capture Vienna. For Osama bin Laden, this was a date when the West gained some dominance over Islam, and by attacking on this date, he hoped to make a step in Islam "winning" the war for worldwide power and influence.
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