Mohammed al-Qahtani has been detained in Guantanamo Bay for nearly 20 years. The Saudi national attempted to meet the mastermind of 9/11.

Among the prisoners released from Guantanamo Bay were a Taliban commander who helped engineer the group's return to power in Afghanistan.

In addition to his Taliban ties, he allegedly was a member of the al-Qaida military committee and directly associated with Osama bin Laden.