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This picture taken on August 13, 2015 shows students at Hailiang International School lighting at a vigil to pray for the victims of the explosions at a chemical warehouse in Tianjin in Zhuji, in eastern China's Zhejiang province. A Chinese military team of nuclear and chemical experts began work on August 13 at the site of two massive explosions in the city of Tianjin, state media said, as pressure grows for authorities to explain the cause of blasts that left 50 dead. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP via Getty Images)

This picture taken on August 13, 2015 shows students at Hailiang International School lighting at a vigil to pray for the victims of the explosions at a chemical warehouse in Tianjin in Zhuji, in eastern China's Zhejiang province. A Chinese military team of nuclear and chemical experts began work on August 13 at the site of two massive explosions in the city of Tianjin, state media said, as pressure grows for authorities to explain the cause of blasts that left 50 dead. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP via Getty Images)
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