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.
The Third Terrorist
"One indicator that this terrorist act had broader implications came directly from Abdul Hakim Murad, Yousef's roommate, childhood friend, and fellow convicted
terrorist. On the day of the bombing, Murad claimed responsibility for this terrorist act from his jail cell in New York. He bragged to his prison guards, verbally and in writing, that the bombing of the Murrah federal building was the work of the "Liberation Army." His confession was similar to the one Yousef had made two years earlier in the immediate aftermath of the first attempt to destroy the World Trade Center. Hours after he drove a Ryder truck into the garage of the north tower of the World Trade Center and detonated the deadly bomb, Yousef called the FBI from a pay phone in Newark International Airport and boasted that the "Liberation Army" had conducted the attack. He then boarded a plane and escaped, ending up in Manila, Philippines. Note: the Oklahoma City Bombing followed a similar pattern to the 1993 attack on the World Trade Center —a rental truck loaded with ammonium-based explosives, using similar detonation devices, based on the strategy of driving a vehicle into or near a target."