The death of a co-founder of Cambodia's genocidal Khmer Rouge regime before a verdict in his trial for crimes against humanity has revived criticism of a tribunal long decried for its slowness.

Thursday's death of 87-year-old Ieng Sary, the regime's foreign minister, has heightened fears that other aging Khmer Rouge leaders could escape punishment over the deaths of an estimated 1.7 million Cambodians during their rule from 1975 to 1979.

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