Myanmarsaid late last month that it would not grant visas to members of a commission appointed by the UN Human Rights Council to investigate human rights violations by the country's state security forces, including the recent abuses in Rakhine State.
The US mission to the UN said violence in Rakhine State against ethnic and religious communitiescontinues to claim lives and there are allegations of sexual violence against women and children.
She said the international community cannot overlook what is happening in Myanmar and "we must stand together and call on the government to fullycooperate with this fact-finding mission".
"The total number of victims will be unknown unless the fact-finding mission is allowed to proceed," the UN mission said.
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Geneva director at global rights group Human Rights WatchJohn Fishersaid denying visas to the members of the fact-finding mission would be "a slap in the face" to victims who suffered grave human rights violations by Myanmar's state security forces.
The rights group said the Myanmar government should immediately announce they will issue visas to the fact-finding mission and fully cooperate with its investigation.
"Otherwise, the governments that pushed to set up this fact-finding mission need to stand up for it and impose a political consequence on Myanmar for blocking its work," Fisher added.