In this Thursday, Aug. 13, 2015 file photo, firefighters in protective gear watch as smoke continues to billow out after an explosion at a warehouse in northeastern China's Tianjin municipality. Huge explosions in the warehouse district sent up massive fireballs that turned the night sky into day in the Chinese port city of Tianjin, officials and witnesses said Thursday. (AP Photo/Ng Han Guan, File)

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The Chinese port of Tianjin was rocked by a massive explosion at a warehouse last week that sent up huge fireballs. About 1,000 firefighters…