Another four Uighurs have been moved to Bermuda.
There are still some 223 detainees at the prison. Some are expected to be transferred abroad while others could face charges in US military tribunals or in American courtrooms.
The US has worries about sending some of the prisoners back to their home countries where they might be persecuted.
Barack Obama, the US president, pledged to close by mid-January 2010 the facility set up by the Bush administration in 2002 to hold people captured after US-led forces invaded Afghanistan.
But recent reports have suggested that the administration may not meet the deadline because of legal, political and diplomatic issues involving the detainees.
Many detainees, including Ahmed, have challenged their detention at Guantanamo in a US federal court.
So far 30 have won legal battles ordering their release while seven have been denied.