Published by the International Consortium of Investigative Journalists (ICIJ) Sunday, the documents offer a rare look into the massive internment camp for Muslim-majority Uyghur in the troubled western region of China.

The 2017 documents reveal a list of guidelines "that effectively serves as a manual for operating the camps now holding hundreds of thousands of Muslim Uighurs and other minorities," said ICIJ. 

The leak shows intelligence briefings of "how Chinese police are guided by a massive data collection and analysis system that uses artificial intelligence to select entire categories of Xinjiang residents for detention," said ICIJ. 

The manual, called a "telegram," is a six-page document that "instructs camp personnel on such matters as how to prevent escapes, how to maintain total secrecy about the camps' existence, methods of forced indoctrination, how to control disease outbreaks, and when to let detainees see relatives or even use the toilet," ICIJ adds.