Mohammed Abdul Malik Bajabu was repatriated to Kenya after it was determined that his detention was "no longer necessary to protect against a continuing significant threat to the national security of the United States," the Defense Department said in a statement.

The Washington Post reported that Bajabu had been arrested in 2007 and was accused of belonging to Al-Qaeda's East Africa branch.

With his release, 29 detainees remain at Guantanamo, down from a peak of nearly 800.

Of them 15 are eligible for transfer, three are eligible for a review for possible release, seven are facing charges and four have been convicted and sentenced, the Defense Department statement said.