Police use tear gas to quell riot in southern China

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Riot police block a road during clashes with rioting Sichuan migrant workers in Zengcheng, near Guangzhou in southern China, in this still image taken from a June 12, 2011 video. Riot police fired tear gas over the weekend to disperse rampaging migrant workers in Zengcheng who were protesting over the mistreatment of a young pregnant street hawker by security guards, media reports said on Monday. REUTERS/Reuters TV via ATV