The release came a week after Defense Secretary Ash Carter said he was working with the White House on a proposal for Congress on shutting the internationally condemned jail at the U.S. naval base in Cuba, where most prisoners have been held without charges or trial.
Though Obama continues to face obstacles from lawmakers to his long-time goal of emptying the prison, the latest transfer, this year's largest, whittles Guantanamo's inmate population to 116, less than half the number when he took office in 2009.
No further large transfers are imminent, said a senior U.S. official, though efforts continue to repatriate prisoners or settle them elsewhere.
The six men sent to Oman, a sultanate bordering Yemen at thetip of the Arabian peninsula, were identified as low-risk detainees cleared years ago for transfer.
The 69 Yemenis still held at Guantanamo make up more than half of the remaining detainees, but Washington has ruled out sending them home because of the chaotic security situation. Iran-backed Houthi rebels have seized large parts of Yemen, including the capital Sanaa, and a Saudi-led coalition is trying to restore Yemen's exiled president to power.
The only other option has been to find third countries to accept the Yemenis. The last transfer was in January, when the United States sent four Yemenis to Oman and one to Estonia.
"We recognize the current security situation in Yemen presents serious challenges to our ability to repatriate Yemenis," the senior U.S. official said.
The prison was opened by Obama's predecessor, George W. Bush, after the Sept. 11, 2001, attacks on the United States, to house terrorism suspects rounded up overseas.
Obama has often renewed his pledge to shut the prison, but lawmakers have restricted his ability to transfer prisoners and have barred him from moving them to the U.S. mainland.
The administration remains intent on seeking to empty the Guantanamo jail by the 2017 end of Obama's presidency.
"We are working feverishly to transfer each of the 51 detainees currently approved for transfer," said Ian Moss, a spokesman on Guantanamo issues at the State Department.
The Pentagon identified the six Yemenis flown to Oman as Idris Ahmad Abd Al Qadir Idris, Sharaf Ahmad Muhammad Mas'ud, Jalal Salam Awad Awad, Saa'd Nasser Moqbil Al Azani, Emad Abdallah Hassan and Muhammad Ali Salem Al Zarnuki.
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