Mohammed al-Qahtani

Mohammed Mana Ahmad al-Qahtani is a Saudi citizen who has been detained as an al-Qaeda agent for 19 years in the United States's Guantanamo Bay detention camps in Cuba. Qahtani allegedly tried to enter the United States to take part in the September 11 attacks as the 20th hijacker and was due to be onboard United Airlines Flight 93 along with the four other hijackers. He was refused entry due to suspicions that he was trying to illegally immigrate. He was later captured in Afghanistan in the battle of Tora Bora in December 2001.