The U.N. is calling for an investigation over a mass grave in Sudan’s West Darfur which contained at least 87 bodies, including members of the ethnic Masalit community. The U.N.’s human rights chief said there is credible information that the paramilitary Rapid Support Forces are responsible. This comes as peace talks appear to have hit a wall and as the U.N. warns Sudan is on the brink of a “full-scale civil war” after three months of deadly fighting.