Leaked files Saturday revealed an unprecedented inside view of the Chinese continuing clampdown on ethnic Uighurs in China’s autonomous Xinjiang province.

Chinese President Xi Jinping urged security forces to “show absolutely no mercy” to minorities, as cited by the New York Times, which obtained 403 pages of internal government documents.

The documents included nearly 200 pages of internal speeches by Xi and other leaders, and more than 150 pages of directives and reports on surveillance and control of the Uighur population in Xinjiang.

Read more: China demands forces show ‘no mercy’ to Uighurs: report moi