A U.S. military prosecutor has filed charges that include aiding terrorism against a Saudi prisoner at Guantanamo. The Pentagon says Ahmed al-Darbi trained with al-Qaida and took part in plots aimed at attacking oil tankers in the Strait of Hormuz and off Yemen.

Army Brig. Gen. Mark Martins, chief prosecutor for the Guantanamo war crimes tribunals, announced the charges Wednesday. He says the alleged crimes were, in his words, "committed to terrorize and wreak havoc on the world economy."

Al-Darbi faces up to life in prison if convicted. A Pentagon legal official must review and approve the charges before al-Darbi can be arraigned.

A lawyer for al-Darbi did not return messages seeking comment. Al-Darbi has previously said he was abused by U.S. forces in Afghanistan.