Myanmar’s de facto leader Aung San Suu Kyi is to miss next week’s UN General Assembly debate as criticism of her handling of the Rohingya crisis grows.
Some 370,000 Rohingya Muslims have fled Rakhine state for Bangladesh since the outbreak of violence last month. Whole villages have been burned down.
The government has been accused by the UN of ethnic cleansing.
Myanmar’s military says it is fighting Rohingya militants and denies reports that it is targeting civilians.
The Rohingya, a mostly Muslim minority in Buddhist-majority Rakhine, have long experienced persecution in Myanmar, which says they are illegal immigrants. They have lived in Myanmar, also known as Burma, for generations but are denied citizenship.
The UN Security Council is due to meet on Wednesday to discuss the crisis.
Has Aung San Suu Kyi changed her mind?
Ms Suu Kyi had been expected to participate in discussions at the General Assembly session in New York, which runs from 19 to 25 September.
A government spokesman, Aung Shin, told Reuters news agency that “perhaps” Ms Suu Kyi has “more pressing matters to deal with”, adding: “She’s never afraid of facing criticism or confronting problems.”
In her first address to the General Assembly as national leader in September last year, the former opposition icon defended her government’s efforts to resolve the crisis over the treatment of the Rohingya.
The Nobel Peace Prize winner, who lived under house arrest for 15 years for her pro-democracy activism, is widely seen as the head of government in Myanmar.
Ms Suu Kyi has been criticised by former supporters in the West for failing to do enough to prevent the violence in Rakhine state.
Fellow Nobel laureates, including the Dalai Lama, Archbishop Desmond Tutu and Malala Yousafzai, have called on Ms Suu Kyi to stop the violence.
What is happening in Rakhine state?
The latest wave of Rohingya fleeing their homes began on 25 August, following attacks by Rohingya militants on police and military posts.
Those who have fled say Myanmar troops responded to the attacks with a brutal campaign of violence and village burnings aimed at driving them out.
Myanmar’s envoy to the UN has blamed the Rohingya insurgents for the violence in Rakhine state and said that his country would never tolerate such atrocities.
Though access to Rakhine state is heavily controlled, the BBC’s Jonathan Head was one of a few journalists taken on a government-run tour recently and witnessed Muslim villages being burned with police doing nothing to stop it.
While the current crisis has seen nearly 400,000 Rohingya flee, the UN says Bangladesh was already hosting several hundred thousand undocumented Rohingya who had fled earlier violence.
Other Rohingya have been living in camps for displaced people within Myanmar.
Could Aung San Suu Kyi stop the violence?
Analysis, by Jonathan Head, South-East Asia Correspondent
Aung San Suu Kyi makes most of the important decisions in her party and cabinet. She also holds the position of foreign minister. The actual President, Htin Kyaw, in practice answers to her.
But on the issue of the Rohingya, Ms Suu Kyi must tread especially carefully. There is little public sympathy for them and inside Rakhine state the Rakhine Buddhists are even more hostile. Conflict between them and the Rohingya, who they refer to as Bengalis, goes back many decades.