Hong Kong (CNN) A series of leaked documents threatens to shine a spotlight on the Chinese government's Xinjiang detention centers, indicating what Beijing claims are voluntary training schools for Muslim-majority Uyghurs are in fact heavily policed re-education camps.

Published by the International Consortium of Investigative Journalists (ICIJ) Sunday, the six documents include one lengthy "telegram" from the government commission in charge of security in Xinjiang, as well as a court ruling and four security bulletins.

The documents, mostly from 2017, reveal plans to construct a large number of heavily secured facilities in which detainees are forcibly taught in the Chinese language, proper "manners", and "ideological education."

Release would only come after a year, and only when the student had achieved the total point score that merited their freedom. "Take the student's score as the basic basis for measuring the effectiveness of education and training and link it directly to rewards, punishments and family visits," the document said.

CNN has not been able to independently verify the six documents. China's Foreign Ministry spokesman Geng Shuang said that the reporting on the cables was a "despicable ploy." He didn't say whether the documents themselves were real or fake.

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