In the camps in Xinjiang, there are even Kazakhs, Hui, and all the Muslim minorities living on Chinese territory.
It should be noted that before setting up these re-education centres in Xinjiang, the Chinese government tested them elsewhere, namely in Tibet. At the time, it created what was called re-education schools for Buddhist monks, a bit like summer camps for deviant populations. It sent Tibetan monks, political opponents, and people supporting on the Internet certain ideas that the Chinese government didn’t support.
These pilot projects were tested in 2014 and 2015. When the Chinese government found not that they were working well, but that they were achieving the desired results, it increased the scale of the projects and set up real internment and concentration camps on the Xinjiang territory. This also affects other minorities, Muslim and non-Muslim alike, who live on Chinese territory.