A group of US lawmakers has urged President Donald Trump’s administration to impose sanctions including asset freezes and visa bans on Chinese officials and companies allegedly tied to a stifling security crackdown and the mass internment of ethnic minority Muslims in camps in a far western region.

The lawmakers sent a letter to Secretary of State Mike Pompeo and Treasury Secretary Steve Mnuchin urging the government to apply sanctions to address the “ongoing human rights crisis” in the region of Xinjiang, in the latest sign that the detentions are raising concerns among Western leaders and governments.

Muslim ethnic minorities in Xinjiang are being detained and tortured and face “egregious restrictions on religious practice and culture” and other abuses, said the letter, which was signed by Florida Senator Marco Rubio and New Jersey Rep Chris Smith and 15 others. It was provided to the media on Wednesday.

The letter singles out Xinjiang’s top official, Chen Quanguo, accused by many of turning the region into a police surveillance state and implementing a system of internment camps, also known as “re-education centers”, where members of the Uighur and other Muslim minorities are locked up for months without trial.

Read: 'Thank the Party!' China tries to brainwash Muslims in internment camps

“The detention of as many as a million or more Uighurs and other predominantly Muslim ethnic minorities in ‘political reeducation’ center or camps requires a tough, targeted, and global response,” the letter said.

Former detainees who spoke to The Associated Press described the internment camps as facilities policed by armed guards where Muslims were forced to disavow their religious beliefs, criticise themselves and their loved ones, and give thanks to the ruling Communist Party. Beatings and deaths have been reported despite authorities’ tight control on information from the region.

The detention program has swept up people, including relatives of American citizens, on ostensible offenses ranging from accessing foreign websites to contacting overseas relatives. Other aspects of the security crackdown the AP has detailed include all-encompassing digital surveillance, mass deployment of police and severe regulations against religious customs and dress.

China denies such internment camps exist but says criminals involved in minor offenses are sent to “vocational education and employment training centers” to help with their rehabilitation and reintegration into society.

“The argument that ‘a million Uighurs are detained in re-education centers’ is completely untrue,” Chinese representative Hu Lianhe said earlier this month in responding to questions raised by the UN’s Committee on the Elimination of Racial Discrimination in Geneva.

China insists tough measures are needed as part of a “People’s War on Terror” to purge separatist and religious extremist elements from Xinjiang, a vast region with more than 10 million Muslims. Deadly ethnic riots in its capital in 2009 killed hundreds and sporadic violence occurred in subsequent years. But reports of violence are increasingly rare and the existence of an effective organised resistance to Chinese rule is widely doubted.

China’s foreign ministry did not immediately respond to a request for comment on the letter.

Explore: Muslims in China's 'Little Mecca' fear eradication of Islam

Rubio and Smith had raised the possibility of imposing sanctions on Chinese officials under the 2016 Global Magnitsky Act in April, asking the US ambassador to Beijing, Terry Branstad, to visit the region and collect information on Xinjiang officials responsible for the mass detention policy.

The Global Magnitsky Act allows the US government to place travel and financial restrictions on individuals anywhere in the world given credible proof of their role in human rights violations or corruption. For the first time in December, US authorities designated 52 people under the act, including a Myanmar general allegedly involved in the deadly crackdown on Rohingya Muslims and a Chinese police official who oversaw the Beijing detention center that held Cao Shunli, a human rights activist who died in custody.

Acting Deputy Assistant Secretary of State Laura Stone said later in April that the US was deeply concerned about the detentions and could take action under the Magnitsky act.

Along with Chen, other Chinese officials named in the letter include Hu, the Chinese delegate to the UN human rights meeting, who is an official with the Communist Party’s United Front Work Department; Xinjiang Deputy Party Secretary Shohret Zakir; and the head of Xinjiang’s Politics and Law Commission Zhu Hailun.

The letter also mentions two companies that could be sanctioned under a separate executive order, Hikvision and Dahua Technology, both of which make video surveillance technology used extensively throughout Xinjiang track residents and restrict their movements.

The letter was signed by a bipartisan group of senators and congressmen, including Ted Cruz and Sherrod Brown.

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