"Hate narratives" from abroad have driven communities in Myanmar further apart, the Southeast Asian nation's leader, Aung San Suu Kyi, said in a social media statement on Thursday.

Patience and time are required to restore trust between the communities, Suu Kyi told Christine Schraner Burgener, the United Nations special envoy on Myanmar on Wednesday, according to the statement on the Nobel Peace laureate's Facebook page.

Since August, nearly 700,000 Rohingya Muslims from mainly Buddhist Myanmar's northern Rakhine state have fled to Bangladesh following a military response to Rohingya insurgent attacks, the United Nations and aid agencies have said.

Many reported killings, rape and arson on a large scale.

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The United Nations said in a statement that in all her discussions in Myanmar, Burgener underlined the importance of accountability.

"She urged ... credible fact-finding measures, and highlighted the readiness on the part of the United Nations and the international community to cooperate in this regard," the statement said.

The United Nations has called the campaign a textbook example of "ethnic cleansing", a charge Myanmar denies.

"The state counsellor also pointed out that the hate narratives from outside the country have driven the two communities further apart," the Facebook statement paraphrased Suu Kyi as saying, without identifying the communities.

Suu Kyi also stressed the need for a forward-looking approach to resolve the issue, it added.

Zaw Htay, a spokesman for the government, did not immediately respond to Reuters' requests to clarify what narratives Suu Kyi was referring to.

In Facebook and Twitter posts since August, Suu Kyi's government has shown support for non-Muslims displaced by the violence and blamed the international community for distributing "fake news" about alleged rights abuses.

Rohingya in Myanmar are denied citizenship, freedom of movement and access to services such as healthcare and education.

The United Nations said Burgener stressed "the importance of condemning incitement to racial hatred and violence, and to take all measures to defuse tensions between the communities."

This month Myanmar and UN agencies signed an outline deal on the return of Rohingya refugees, a warming of ties after a low point hit last year when the government suggested some agencies provided food to Rohingya militants.