Mohamedou Ould Slahi, author of the best-selling Guantanamo Diary, has been freed from the U.S. detention facility at Guantanamo Bay after 14 years. He was never formally charged nor tried.

The U.S. Department of Defense announced the transfer of Mohamedou Ould Slahi from the detention facility at Guantanamo Bay to the government of Mauritania. He reportedly arrived in the West African nation of Mauritania Wednesday aboard a U.S. military plane.