Zacarias Moussaoui, French citizen, sentenced to life in prison related to September 11 attacks

Zacarias Moussaoui is a French member of al-Qaeda who pleaded guilty in a U.S. federal court to conspiring to kill citizens of the United States as part of the 9/11 attacks. He is serving life imprisonment without the possibility of parole at the Federal ADX Supermax prison in Florence, Colorado. Moussaoui is the only person ever convicted in a U.S. court in connection with the September 11 attacks.

The September 11 attacks, also known as 9/11, were four coordinated Islamist terrorist suicide attacks by al-Qaeda against the United States in 2001. Nineteen terrorists hijacked four commercial airliners, crashing the first two into the Twin Towers of the World Trade Center in New York City and the third into the Pentagon in Arlington County, Virginia. The fourth plane crashed in a rural Pennsylvania field during a passenger revolt. The attacks killed 2,977 people, making it the deadliest terrorist attack in history. In response to the attacks, the United States waged the global war on terror over multiple decades to eliminate hostile groups deemed terrorist organizations, as well as the governments purported to support them.