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DAMASCUS, SYRIA - SEPTEMBER 13: Smoke rises from Assad suburb in northeast of Damascus on September 13, 2015, after Syrian opposition forces attacked the regime controlled areas. (Photo by Stringer/Anadolu Agency/Getty Images)

DAMASCUS, SYRIA - SEPTEMBER 13:  Smoke rises from Assad suburb in northeast of Damascus on September 13, 2015, after Syrian opposition forces attacked the regime controlled areas. (Photo by Stringer/Anadolu Agency/Getty Images)