However, this article is from 2019 and explains the problem the Chinese Government faced ..
Uyghur terrorists have killed 1200 Chinese in the past ten years and, since 2014, more than 1,500 terrorist gangs have been destroyed, 13,000 terrorists arrested and 2,000 explosive devices seized in Xinjiang. In 2015, China passed its Counter-terrorism Law, which allows Beijing to take all necessary measures to put down any activities or behavior it deems threatening to state security and sovereignty. These threats can be summarized by the oft-recited Chinese goal of ridding itself of “the three evils” – terrorism, separatism and religious extremism. The law was created in response to seven terrorist attacks in China between the start of 2013 and the summer of 2014, five of which were in Xinjiang and all of which were affiliated with the East Turkestan Islamic Movement, which is active in Syria.
Also worth a quick look at this re-education camp.