A UN envoy calls for an independent investigation into allegations of violence . The alleged ` ` are of grave import , '' Tomas ##i says . On Saturday , Quintana said an investigation in Rakhine is important to guarantee accountability . Sectarian violence has surged in the western state of Guerrero .
A UN envoy calls for an independent investigation into allegations of violence . The alleged ` ` are of grave import , '' Tomas ##i says . Sectarian violence has surged in the western state of Guerrero .