Zacarias Moussaoui (Arabic: زكريا موسوي Zakariyyā Mūsawiy; born May 30, 1968) is a French citizen of Moroccan escent who was convicted of conspiring to kill Americans as part of the September 11, 2001, terrorist attacks. As a result of his conviction, he is serving a life sentence at the Federal ADX Supermax prison in Florence, Colorado.