China says it is banning a United States research company and two analysts who have reported extensively on claims of human rights abuses committed against Uyghurs and other Muslim minority groups native to the country’s far northwestern region of Xinjiang.

Foreign Ministry spokesperson Mao Ning was quoted as announcing late Tuesday night that Los Angeles-based research and data analytics firm Kharon, its director of investigations, Edmund Xu, and Nicole Morgret, a human rights analyst affiliated with the Center for Advanced Defense Studies, would be barred from traveling to China. Also, any assets or property they have in China will be frozen and organizations and individuals in China are prohibited from making transactions or otherwise cooperating with them.

In a statement on the Ministry of Foreign Affairs website, Mao said the sanctions against the company, Xu and Morgret were retaliation for a yearly U.S. government report on human rights in Xinjiang. Uyghurs and other natives of the region share religious, linguistic and cultural links with the scattered peoples of Central Asia and have long resented the Chinese Communist Party’s heavy-handed control and attempts to assimilate them with the majority Han ethnic group.