Workers clean the blood stains at the scene of a knife attack on the square of Guangzhou railway station in Guangzhou, in southern China's Guangdong province on May 6, 2014. Six people were wounded in a knife attack at a Chinese train station, police said, after a string of violent episodes at transport hubs authorities blame on "terrorists" from the restive region of Xinjiang. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP via Getty Images)
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