The departing U.N. human rights envoy for Myanmar said its military is engaged in activities against rebels that may amount to "war crimes and crimes against humanity" in Rakhine and Chin states, and that she was "enraged" and "saddened" by the situation in the country after six years in the role.

The South Korean special rapporteur said the basis for her conclusion about possible war crimes was that the armed forces, known as the Tatmadaw, have ramped up attacks against civilians in recent weeks with air and artillery strikes.

Two military spokesmen did not answer phone calls seeking comment. A government spokesman also did not answer phone calls seeking comment. The army has denied targeting civilians and has declared the insurgent group it is fighting, the Arakan Army, a terrorist organization.