World Trade Center Health Program
On September 11, 2001, 19 terrorists associated with the Islamist militant group al-Qaeda hijacked four passenger jets in a series of suicide attacks on the United States, killing 2,996 people and injuring more than 6,000 others. Hijackers flew planes into two main towers of the World Trade Center, resulting in the collapse of three buildings of the World Trade Center complex, and the Pentagon, resulting in the partial destruction of the western side in the building. The resulting dust cloud due to the collapse of the World Trade Center covered Manhattan for days and contained thousands of tons of toxic debris, including asbestos and other known carcinogens. Another hijacked plane crashed into a field in Shanksville, Pennsylvania following an attempt by the passengers to retake control of the plane. No one in the airliners survived.
As of 2011, approximately 18,000 people have received medical treatment for illnesses related to toxic dust from the World Trade Center site. A study of rescue workers released in April 2010 found that all those studied had impaired lung functions, and that 30–40% were reporting little or no improvement in persistent symptoms that started within the first year of the attack. In 2011 a major research study showed significant long term medical and psychological effects among first responders to the World Trade Center site. These effects include elevated levels of asthma, sinusitis, Gastroesophageal reflux disease and posttraumatic stress disorder.
Presidency of George W. Bush
On September 11, 2001, al-Qaeda terrorists hijacked four airliners and flew two them into the twin towers of the World Trade Center in New York City, destroying both 110-story skyscrapers. Another plane crashed into Pentagon, while the final plane was brought down in Pennsylvania following a struggle between the terrorists and the aircraft's passengers. The attacks had a profound effect on many Americans, who felt vulnerable to international attacks for the first time since the end of the Cold War. Appearing on national television on the night of the attacks, Bush promised to punish those who had aided the attacks, stating, "we will make no distinction between the terrorists who committed these acts and those who harbor them." In the following days, Bush urged the public to renounce hate crimes and discrimination against Muslim-Americans and Arab-Americans. He also declared a "War on Terror", instituting new domestic and foreign policies in an effort to prevent future terrorist attacks.