A U.N. envoy calls for an independent investigation into allegations of abuses . The United Nations says it is investigating the alleged abuse and has asked a panel to report back in six months. Sectarian violence has surged in the western state of Rakhine .
A U.N. envoy calls for an independent investigation into allegations of abuses . The accusations `` are of grave concern , '' Tomas Quintana says . Sectarian violence has surged in the western state of Rakhine .