TIANJIN, CHINA - AUGUST 24: (CHINA OUT) Soldiers of a PLA chemical-defence unit detect toxic substance at Tianjin blasts scene on August 24, 2015 in Tianjin, China. The death toll from the Tianjin warehouse explosions two weeks ago has risen to 139, and 34 others remain missing, rescue authorities said on Wednesday. (Photo by VCG/VCG via Getty Images)
