The United Nations has said a planned visit to the site of alleged ethnic cleansing of Rohingya Muslims, has been postponed by the Burmese authorities because of bad weather.

UN officials and other diplomats were scheduled to fly to western Rakhine state, from where up to 500,000 Rohingya have fled in recent weeks to neighouring Bangladesh, to escape torture and atrocities carried out by the Burmese military.

The Burmese authorities, whose de facto leader is Aung San Suu Kyi, have previously tried to restrict access to the region for journalists and diplomats. UN aid personnel were obliged to leave after troops launched a crackdown on Rohingya militants who had attacked police posts.

Burma State Counsellor Aung San Suu Kyi delivers a speech to the nation over Rakhine and Rohingya situation in Naypyitaw (Reuters)

Eri Kaneko, a spokeswoman for the Office of the UN Secretary General said her colleagues in Burma were told the trip had been postponed because of bad weather. “This is the official reason we have been given,” she told The Independent. She said the UN was hopeful the rescheduled visit would happen soon in order to allow increased access to the area.

The UN Secretary Council is due to meet to discuss the issue, after French President Emanuel Macron last week described what had happened as “genocide”. The UN has termed it a “textbook case of ethnic cleansing”.

While the UN visit was postponed, Mark Field, the British foreign minister, became the first such minister from outside of the region to see Rakhine after he travelled to Burma and met with Ms Suu Kyi. He said he pushed her to come up with an urgent solution to the crisis.

“What we have seen in Rakhine in the past few weeks is an absolute and unacceptable tragedy. We need the violence to stop and all those who have fled to be able to return to their homes quickly and safely,” he said in a statement.

Andrew Mitchell responds to claim British army are training troops involved in Rohingya abuses

“During my meetings with [Ms] Suu Kyi and others, I strongly emphasised the need for Burma to heed the Security Council’s call to end violence and allow humanitarian access to those in need of aid.”

Britain’s relationship with Burma, which secured its independence in 1948, has shifted sharply in recent years. During the long years of military dictatorship, it was a strong backer of economic sanctions and discreetly supported grassroots democracy movements in the country, including Ms Suu Kyi’s National League for Democracy.

Since her release from house arrest and her ascendancy to become Burma’a Counsellor, a position specially created for her since the current constitution prevents her from being president, the UK and US have pushed for the opening up of the country and the lifting of sanctions. Some say this happened too fast.

Earlier this month, Britain found itself being criticised for continuing to fund training the Burmese military, despite it being accused of killing up to 1,000 Rohingya Muslims as part of its operation.

Andrew Mitchell, the former International Development Secretary, defended the programme which he said was “at a very early stage”.

“This is a contract for training troops at a very early stage,” he told the BBC. “It is meant to address issues of respect for human rights and the treatment of civilians. This is obviously an absolutely critical area and I think that Britain should get involved in that.”

Bangladesh’s leader, Sheikh Hasina, has urged Burma to take back the migrants while planning emergency camps for half-a-million people.

Rohingya refugees – in pictures Show all 15 1 /15 Rohingya refugees – in pictures Rohingya refugees – in pictures A young girl and a baby wade through mud after arriving in Whaikhyang, Bangladesh from Burma on 10 September Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya refugees walk through a camp in Whaikhyang, Bangladesh after arriving from Burma Dan Kitwood/Getty Images Rohingya refugees – in pictures A young Rohingya refugee gathers firewood after arriving in Whaikhyang, Bangladesh from Burma Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya refugees wait for sacks of rice to be distributed in Whaikhyang, Bangladesh Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya Muslim refugees arrive on a boat in Whaikhyang, Bangladesh after crossing from Burma on 8 September Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya Muslim refugees react after being re-united with each other after arriving in Whaikhyang, Bangladesh on a boat from Burma Getty Rohingya refugees – in pictures Rohingya Muslim refugees walk along the remains of a road after arriving in Whaikhyang, Bangladesh on a boat from Burma Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya Muslim refugees wade through water after arriving in Whaikhyang, Bangladesh by boat from Burma Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya Muslim refugees wade through water after arriving in Whaikhyang, Bangladesh by boat from Myanmar Dan Kitwood/Getty Images Rohingya refugees – in pictures Rohingya Muslim refugees stand in the rain after arriving in Whaikhyang, Bangladesh by boat from Burma Dan Kitwood/Getty Images Rohingya refugees – in pictures Indian children hold placards and shout slogans during a protest against the alleged persecution of the Rohingya Muslims in Burma EPA/Raminder Pal Singh Rohingya refugees – in pictures Supporters of the Difa-e-Pakistan Council (DPC), an Islamic organisation, listen to their leaders' speeches against Burma's persecution of Rohingya Muslims, during a demonstration in Karachi Reuters/Akhtar Soomro Rohingya refugees – in pictures Hundreds of Iranians take part in a protest against violence in Myanmar after weekly Friday prayers, in Tehran EPA/Abedin Taherkenareh Rohingya refugees – in pictures Indonesian Muslim activists hold placards and shout slogans during a protest against the alleged persecution of the Rohingya minority in Magelang, Central Java, Indonesia EPA/Ali Lutfi Rohingya refugees – in pictures Members of an Islamic organisation shout slogans against the Burma government during a protest in Dhaka, Bangladesh EPA

Ms Suu Kyi, who was awarded the Nobel Peace Prize 1991, has outraged and bewildered many of her supporters around the world, who have urged her to denounce the violence that has taken place.

She recently delivered a national address in which she called for patience - something that did not silence her critics.

The authorities say the Rohingya are not among the country’s 135 officially recognised ethnic groups. In 1982, military ruler Ne Win introduced a new law that effectively rendered them stateless and set controls on where they could live, the jobs they could do and who they could marry.

Given the situation on the ground, many Rohingya seek to leave by whatever means they can.