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DAMASCUS, SYRIA - AUGUST 16: Bodies of Syrians seen after Assad regime forces vacuum bomb air-strike staged to a marketplace inside residential areas in Douma Town of East Ghouta region of Damascus, Syria on August 16, 2015. Casualties reported after strike. Vacuum bomb is a type of explosive that utilizes oxygen from the surrounding air to generate an intense, high-temperature explosion. (Photo by Motasem Rashed/Anadolu Agency/Getty Images)

DAMASCUS, SYRIA - AUGUST 16: Bodies of Syrians seen after Assad regime forces vacuum bomb air-strike staged to a marketplace inside residential areas in Douma Town of East Ghouta region of Damascus, Syria on August 16, 2015. Casualties reported after strike. Vacuum bomb is a type of explosive that utilizes oxygen from the surrounding air to generate an intense, high-temperature explosion. (Photo by Motasem Rashed/Anadolu Agency/Getty Images)