BEIJING (Reuters) - A group of 15 Western ambassadors in Beijing, spearheaded by Canada, are seeking a meeting with the top official in China’s restive, heavily Muslim Xinjiang region for an explanation of alleged rights abuses against ethnic Uighurs.

The envoys are making their request in a letter to Chen Quanguo, Xinjiang’s Communist Party boss, according to a copy of a draft letter seen by Reuters.

The move represents unusually broad, coordinated action by a group of countries over a human rights issue in China, and illustrates the mounting backlash Beijing is facing over its crackdown in the western region.

Beijing has faced an outcry from activists, academics, foreign governments and U.N. rights experts over mass detentions and strict surveillance of the mostly Muslim Uighur minority and other Muslim groups who call Xinjiang home.

In August, a United Nations human rights panel said it had received many credible reports that a million or more Uighurs in China are being held in what resembles a “massive internment camp that is shrouded in secrecy”.

China says it is not enforcing arbitrary detention and political re-education, but rather some citizens guilty of minor offences were being sent to vocational centers to provide employment opportunities.

Beijing bristles at criticism of its human rights situation, espousing a policy of non-interference in the affairs of other countries. China’s top diplomat said on Tuesday the world should ignore “gossip” about Xinjiang and trust authorities there.

It was not clear if the letter had been sent yet or if it contents could be revised. One diplomatic source said it was being passed around for more countries to potentially sign.

Several other diplomats familiar with the letter would only confirm its existence and refused to discuss it further, citing its sensitivity. All of the diplomats declined to be identified.

FILE PHOTO: Xinjiang Uighur Autonomous Region (XUAR) Party Secretary Chen Quanguo attends a group discussion session on the second day of the 19th National Congress of the Communist Party of China at the Great Hall of the People in Beijing, China October 19, 2017. REUTERS/Tyrone Siu/File Photo

Many foreign governments have refrained from speaking out over the Xinjiang situation, with diplomats saying countries are fearful of angering China, an increasingly weighty diplomatic player thanks to its economic heft and initiatives such as the Belt and Road infrastructure program.

‘WE ARE DEEPLY TROUBLED’

In the draft letter addressed directly to Chen, who outranks the region’s ethnic Uighur governor Shohrat Zakir, the ambassadors said they were highly concerned by the U.N. findings on Xinjiang.

“We are deeply troubled by reports of the treatment of ethnic minorities, in particular individuals of Uyghur ethnicity, in the Xinjiang Uyghur Autonomous Region,” the draft reads, using an alternate spelling for Uighur.

“In order to better understand the situation, we request a meeting with you at your earliest convenience to discuss these concerns.”

The letter is copied to China’s Foreign Ministry, the Ministry of Public Security and the Communist Party’s international department.

It is not possible to directly contact any senior Chinese leader for comment.

The Xinjiang government, Ministry of Public Security, the party’s international department and party’s spokesman’s office did not respond to requests for comment.

Chinese Foreign Ministry spokeswoman Hua Chunying said she had not seen the letter, and that ambassadors were welcome to Xinjiang but if “they want to go with the intention of pressuring the Xinjiang government, then this is definitely problematic”.

“As ambassadors, their role should firstly be to positively promote the mutual understanding, trust and cooperation between the country where they are stationed and the one they are sent from, and not to gossip, making powerless demands of the country they are stationed in and doing things that interfere in that country’s internal affairs,” Hua told a daily news briefing.

“We welcome well-intentioned attempts to understand the situation. Xinjiang is an open region. But we will firmly oppose ill-intentioned and biased attempts to interfere in the affairs of our local governments, or rashly criticize China over its internal affairs,” she added.

China has said Xinjiang faces a serious threat from Islamist militants and separatists who plot attacks and stir up tensions with the ethnic Han Chinese majority.

The letter carries the names of 15 Western ambassadors, including the Canadian, British, French, Swiss, European Union, German, Dutch and Australian envoys. The other countries’ ambassadors names in the letter are Ireland, Sweden, Belgium, Norway, Estonia, Finland and Denmark.

Four diplomats familiar with the letter and its contents said Canada had taken the lead in its drafting.

Canada’s Foreign Ministry, in a statement sent to Reuters, did not comment directly on the letter but expressed deep concern over the reports of detention and mass surveillance of Uighurs and other Muslims in Xinjiang.

“The Minister of Foreign Affairs raised the situation faced by the Uyghurs directly with China’s Foreign Minister at the UN General Assembly. Canada regularly raises concerns about Xinjiang with Chinese authorities both publicly and privately, bilaterally and multilaterally, and will continue to do so.”

The EU, British, German, Swedish, Swiss, Belgian, Dutch, Finnish and Norwegian embassies declined to comment on the letter.

The Australian Department of Foreign Affairs and Trade said the government was concerned about the situation in Xinjiang and officials had conveyed these concerns to China on a number of occasions.

The Irish, Danish, French and Estonian embassies did not respond to requests for comment.

The United States is not represented on the letter, although non-U.S. diplomats say the country has been deeply involved in advocacy on the Xinjiang issue.

“We remain alarmed that since April 2017 the Chinese government has detained an estimated 800,000 to possibly more than 2 million Uighurs, Kazaks and other Muslims in internment camps for political re-education,” a U.S. embassy spokesman said, responding to a question regarding the letter.

“The United States will continue to call on China to end these counterproductive policies and free all those arbitrarily detained. We are committed to promoting accountability for those who commit human rights violations and abuses, including by considering targeted measures against Xinjiang officials.”

The United States has said it is considering sanctions against Chen, other officials and Chinese companies linked to allegations of rights abuses in Xinjiang.