The tribunal is holding five former senior Khmer Rouge officials pending trials expected to begin later this year related to atrocities committed during its rule. 


Among them is Ieng Thirith's husband, Ieng Sary, who was the foreign minister in the Khmer Rouge government.


He lost his own appeal against his continued detention by the trubunal last week.


Some estimates say up to 2 million people died during the Khmer Rouge's four years in power in the late 1970s.