Myanmar faces mounting pressure over Rohingya refugee exodus

But China, which competes for influence in its southern neighbour with the United States, said it backed Myanmar's efforts to safeguard "development and stability".

The government of Buddhist-majority Myanmar says its security forces are fighting Rohingya militants behind a surge of violence in Rakhine state that began on Aug. 25, and they are doing all they can to avoid harming civilians.

The government says about 400 people have been killed in the fighting, the latest in the western state.

The top U.N. human rights official denounced Myanmar on Monday for conducting a "cruel military operation" against Rohingya, branding it "a textbook example of ethnic cleansing".

The United States said the violent displacement of the Rohingya showed Myanmar's security forces were not protecting civilians. Washington has been a staunch supporter of Myanmar's transition from decades of harsh military rule that is being led by Nobel peace laureate Aung San Suu Kyi.

"We call on Burmese security authorities to respect the rule of law, stop the violence, and end the displacement of civilians from all communities," the White House said in a statement.

Myanmar government spokesmen were not immediately available for comment but the foreign ministry said shortly before the U.S. statement was issued that Myanmar was also concerned about the suffering. Its forces were carrying out their legitimate duty to restore order in response to acts of extremism.

"The government of Myanmar fully shares the concern of the international community regarding the displacement and suffering of all communities affected by the latest escalation of violence ignited by the acts of terrorism," the ministry said in a statement.

Myanmar’s government regards Rohingya as illegal migrants from neighbouring Bangladesh and denies them citizenship, even though many Rohingya families have lived there for generations.

Unverified reports from refugees and rights groups paint a picture of widespread attacks on Rohingya villages in the north of Rakhine by the security forces and ethnic Rakhine Buddhists, who have put numerous Muslim villages to the torch.

Authorities deny that and say nearly 30,000 Buddhist villagers have also been displaced, fleeing to towns to the south.

The exodus seeking safety in Bangladesh shows no sign of slowing with 370,000 the latest estimate, according to a U.N. refugee agency spokeswoman, up from an estimate of 313,000 on the weekend.

Attacks by a Rohingya insurgent group, the Arakan Rohingya Salvation Army (ARSA), on police posts and an army base in the north of Rakhine on Aug. 25 provoked the military counter-offensive that refugees say is aimed at pushing Rohingya out of the country.

A similar but smaller wave of attacks by the same insurgents last October also led to what critics said was a heavy-handed response by the security forces that sent 87,000 Rohingya fleeing to Bangladesh.

Myanmar has rebuffed a ceasefire declared by ARSA to enable the delivery of aid in the north of Rakhine State, declaring that it did not negotiate with terrorists.

Bangladesh is seeking help as it struggles to cope with the latest influx, who have joined more than 400,000 already there.

Bangladeshi Prime Minister Sheikh Hasina said Myanmar should set up safe zones to enable the refugees to go home.

"Myanmar will have to take back all Rohingya refugees who entered Bangladesh," Hasina said on a visit to the Cox's Bazar border district where she distributed aid.

"Myanmar has created the problem and they will have to solve it," she said, adding: "We want peaceful relations with our neighbours, but we can’t accept any injustice.

"Stop this violence against innocent people."

Myanmar has said those who can verify their citizenship can return but most Rohingya are stateless.

The Bangladeshi parliament passed a resolution on Monday urging the international community to mount pressure on Myanmar to resolve the crisis.

Chinese foreign ministry spokesman Geng Shuang told a briefing in Beijing "the international community should support Myanmar in its efforts to safeguard development and stability".

China ally Pakistan, in a speech to the U.N. Human Rights Council in Geneva, on behalf of the Organisation of Islamic Cooperation, called on Myanmar to stop making "unfulfilled promises".

"Discrimination, violence and acts of hatred are intolerable," Pakistan said.

Bangladeshi officials started registering the refugees on Tuesday, taking photographs and fingerprints, in the hope of bringing order to the chaos.