Osama bin Laden, leader of terrorist group al-Qaeda, and Khalid Sheikh Mohammed, architect of the attacks, were the main leaders in this event that took place on September 11, 2001. In 1996 bin Laden signed his first fatwā telling American soldiers to leave Saudi Arabia. Again in 1998, he signed his second fatwā objecting American foreign policy and told Muslims to attack Americans "until the stated grievances are reversed."
American Airlines Flight 11 and United Airlines Flight 175 left Logan Airport in the morning and were each taken over by five hijackers who flew the planes into the World Trade Center towers in New York, USA
American Airlines a Flight 77 left Washington Dulles Internationl Airport in the morning and was taken over by five hijackers who flew the plane into the Pentagon in Arlington County, Virginia
United Airline Flight 93 left The Newark International airport in the morning toward San Francisco and five hijackers crashed into a field in Shanksville, Pennsylvania due to passengers attempting to stop the hijackers