Police in Beijing arrest 139 people for spreading religious extremism online . Arrest occurred amid wider crackdown on internet censorship in China . This strategy undermines sympathies at home and abroad for legitimate grievances of the Uyghurs , he added . Ethnic tensions exist between Han Chinese and predominantly Muslim Uyghurs .
Police in Beijing arrest 139 people for spreading religious extremism online . Arrest occurred amid wider crackdown on internet censorship in China . Ethnic tensions exist between Han Chinese and predominantly Muslim Uyghurs .