The largest part of the population (46,5 %) in Xinjiang, where Han Chinese have however grown to 39% through a government-sponsored immigration program aimed at sinicization. Uyghurs are not ethnically Chinese and speak their own Turkic Uyghur language. Many Uyghurs do not speak Chinese at all. The overwhelming majority of the Uyghurs are Sunni Muslim. They experience a severe religious persecution, and one million of them have been taken to the dreaded transformation through education camps.