Cui is currently being held under criminal detention on suspicion of "picking quarrels and stirring up trouble," a charge frequently leveled at peaceful critics of the ruling Chinese Communist Party.
It was unclear what had triggered his detention, but Cui has been an outspoken critic of China's mass incarceration of Uyghurs and other Muslims in the northwestern region of Xinjiang, where authorities have placed as many as 1.8 million Uyghurs and other Muslim minorities accused of harboring “strong religious views” and “politically incorrect” ideas in a network of internment camps since April 2017.