Casualties of the September 11 attacks
2,974 victims were confirmed to have died in the initial attacks; this includes Sneha Anne Philip, a doctor, who in 2008 was ruled to have died on 9/11. In 2007, the New York City medical examiner's office began to add people who died of illnesses caused by exposure to dust from the site to the official death toll. The first such victim was a woman, a civil rights lawyer, who had died from a chronic lung condition in February 2002. In September 2009, the office added a man who died in October 2008, and in 2011, a male accountant who had died in December 2010. This raises the number of victims at the World Trade Center site to 2,753, and the overall 9/11 death toll to 2,996.
History of laws concerning immigration and naturalization in the United States
The terrorist attacks on September 11, 2001 affected American perspectives on many issues, including immigration. A total of 20 foreign terrorists were involved, 19 of whom took part in the attacks that caused the deaths of 2,977 victims, most of them civilians. The terrorists had entered the United States on tourist or student visas. Four of them, however, had violated the terms of their visas. The attack exposed long-standing weaknesses in the U.S. immigration system that included failures in the areas of visa processing, internal enforcement, and information sharing.