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A 2009 file-photo showing flags wave above the sign for Camp Justice, the site of the US war crimes tribunal compound, at Guantanamo Bay US Naval Base, Cuba. Image Credit: AP

WASHINGTON: Six men long held at Guantanamo Bay arrived Saturday in Oman, the first movement of detainees out of the US prison for terrorism suspects in five months as Congress considers new restrictions on transfers.

The six detainees - all from Oman's war-torn Mideast neighbour Yemen - boarded a flight from the US prison in Cuba on Friday, bringing Guantanamo's population down to 116. The move means President Barack Obama has now transferred more than half of the 242 detainees who were at Guantanamo when he was sworn into office after campaigning to close it.

Yet Obama remains far from achieving his closure goal, with just a year and a half left in office, final transfer approvals coming slowly from the Pentagon and lawmakers threatening to make movement out even harder. The transfers to Oman are the first to be given final approval by Defence Secretary Ash Carter, who has been on the job four months.

The six new transfers include Emad Abdullah Hassan, who has been on hunger strikes since 2007 in protest of his confinement without charge since 2002. In court filings protesting force-feeding practices, Hassan said detainees have been force-fed up to a gallon at a time of nutrient and water.

The five other detainees sent to Oman were identified by the Pentagon as Idris Ahmad Abdul Qadir Idris, Sharaf Ahmad Mohammad Mas'ud, Jalal Salam Awad Awad, Sa’ad Nasser Moqbil Al Azani and Mohammad Ali Salem Al Zarnuki.

"The United States is grateful to the Government of Oman for its humanitarian gesture and willingness to support ongoing U.S. efforts to close the Guantanamo Bay detention facility," the Defence Department said in a statement announcing the transfer. "The United States coordinated with the Government of Oman to ensure these transfers took place consistent with appropriate security and humane treatment measures."

The 11 detainees transferred so far in 2015 have all been from Yemen. Forty-three of the 51 remaining detainees who have been approved for transfer are from Yemen. The Obama administration won't send them home due to instability in Yemen and has been looking for other nations willing to accept them.

"We are working feverishly to transfer each of the 51 detainees currently approved for transfer," said Ian Moss, who works on detainee transfers at the State Department. "It is not in our national security interest to continue to detain individuals if we as a government have determined that they can be transferred from Guantanamo responsibly."