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This photo taken on August 13, 2015 shows a firefighter walking past damaged vehicles after a series of explosions at a chemical warehouse hit the city of Tianjin, in northern China. A Chinese military team of nuclear and chemical experts began work on August 14 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 photo taken on August 13, 2015 shows a firefighter walking past damaged vehicles after a series of explosions at a chemical warehouse hit the city of Tianjin, in northern China. A Chinese military team of nuclear and chemical experts began work on August 14 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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AFP STR