The United Nations Mission in South Sudan said on Wednesday it was gravely concerned about the reported execution of four rebels in the north of the country on Aug. 7.
South Sudan erupted into civil war shortly after declaring independence from Sudan in 2011, which pitted rival communities against each other and plunged the country into violence and lawlessness.
A peace agreement signed three years ago is largely holding but the transitional government has been slow to unify the various factions of the military into a single unit, write a new constitution and pave the way to elections.