The U.S. has transferred a dozen Guantanamo detainees to Afghanistan, Yemen and the Somaliland region as the Obama administration continues to move captives out of the facility in Cuba in preparation for its closure.

The Justice Department said Sunday that a government task force had reviewed each case. Officials considered the potential threat and the government's likelihood of success in court challenges to the detentions.

Over the weekend, four Afghan detainees were transferred to their home country. Two Somali detainees were transferred to authorities in Somaliland, the semi-autonomous northern region of Somalia. Six Yemeni detainees also were sent home.

The Justice Department said that since 2002, more than 560 detainees have departed the military prison in Cuba and 198 remain.