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SANAA, YEMEN - MARCH 28: Smoke rises from the Faj Attan Hill following airstrikes staged by warplanes belonging to a Saudi-led Arab coalition as part of an anti-Houthi offensive on March 28, 2015 in Sanaa, Yemen. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)

SANAA, YEMEN - MARCH 28: Smoke rises from the Faj Attan Hill following airstrikes staged by warplanes belonging to a Saudi-led Arab coalition as part of an anti-Houthi offensive on March 28, 2015 in Sanaa, Yemen. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)