(TAIPEI, Taiwan) — Police in China’s Inner Mongolia region have detained at least 23 people following protests last week against a new policy that replaces Mongolian-language textbooks with Chinese ones in classrooms. The push to use the new textbooks, which started in other ethnic minority regions such as Xinjiang and Tibet in 2017, has prompted demonstrations and school boycotts by ethnic Mongolians in at least five cities and counties in Inner Mongolia. The 23 detentions were across eight banners, the regional word for counties, according to an Associated Press tally of nine local police reports over the past several days.