US: 9/11 attack mastermind, Khalid Shaikh Mohammed still awaits trial
Even after 21 years and 2,977 fatalities in the World Trade Centre twin towers and Pentagon attacks on September 11, 2001, the main accused Khalid Shaikh Mohammed is still awaiting trial. The 9/11 attack happened when four commercial aircraft were hijacked by 19 Al-Qaeda terrorists, who also carried out assaults across the country. The first two hijacked aircraft crashed into the World Trade Center twin towers in New York City, the third in Pentagon and the fourth headed for a federal facility in Washington, DC, crashed into a field instead.