In 1989, China banned a book titled《性风俗》 "Xing Fengsu" ("Sexual Customs") which insulted Islam and placed its authors under arrest after protests in Lanzhou and Beijing by Chinese Hui Muslims, during which the Chinese police provided protection to the Hui Muslim protesters, and the Chinese government organized public burnings of the book. The Chinese government assisted them and gave into their demands because Hui do not have a separatist movement, unlike the Uyghurs, A collection of brain teasers published in Sichuan in 1993 caused similar effects, and the three editors of the book were sentenced to 2–5 years. Hui Muslim protesters who violently rioted by vandalizing property during the protests against the book were let off by the Chinese government and went unpunished while Uyghur protesters were imprisoned.