U.S. defense officials say a member of the military at the Guantanamo Bay naval base in Cuba has been charged with engaging in espionage.
Pentagon officials say a member of the U.S. Air Force is being held at Vandenberg Air Force Base in California.
He is identified as Senior Airman Ahmad Al-Halabi and has been charged with several counts related to espionage, including aiding the enemy, disobeying a lawful order and making false statements.
He had been serving as an Arabic language translator at the Guantanamo Bay prison where 660 detainees from the U.S.-led war in Afghanistan are being held.
The charges come a few days after U.S. officials confirmed the arrest of Captain Youssef Yee, who was taken into custody earlier this month as he re-entered the United States from Guantanamo, where he served as a chaplain to Muslim prisoners at the base.
He is reportedly being held on suspicion of espionage and possession of classified documents.
Pentagon officials say an investigation into possible security breaches at the Guantanamo base is continuing.
Those being detained at the base are accused of having links to the al-Qaida terrorist network or Afghanistan's fallen Taleban government.