Zacarias Moussaoui (Arabic: زكريا موسوي) (born May 30, 1968) is a French citizen of Moroccan descent who has testified that he was involved in the conspiracy that resulted in the September 11, 2001 attacks. He was taken into custody by the Federal Bureau of Investigation on August 16, 2001 after attending a flight school in Eagan, Minnesota where an instructor expressed concerns about the abilities and motivations of his student. After the attacks unfolded, he was described as a possible "20th hijacker", though he maintained that he was uninvolved with that plan up until pleading guilty in April 2005 to charges brought against him. He is the only person in the United States to have been charged in connection with the September 11 attacks. Moussaoui was sentenced to life in prison without a chance for parole.