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.
Ahmed Omar Saeed Sheikh
On 6 October 2001, a senior-level US government official, told CNN that US investigators had discovered Saeed (Sheik Syed), using the alias "Mustafa Muhammad Ahmad" had sent about $100,000 from the United Arab Emirates to Mohamed Atta. "Investigators said Atta then distributed the funds to conspirators in Florida in the weeks before the deadliest act of terrorism on U.S. soil that destroyed the World Trade Center, heavily damaged the Pentagon and left thousands dead. In addition, sources have said Atta sent thousands of dollars — believed to be excess funds from the operation — back to Syed in the United Arab Emirates in the days before September 11." CNN later confirmed this.