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SANAA, YEMEN - MAY 12: Smoke billows after Saudi-led coalition airstrikes hit the Houthi targets in Yemeni capital Sanaa on May 12, 2015, as Saudi Arabia and its Arab allies continue to launch military campaign targeting Houthi positions across Yemen. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)

SANAA, YEMEN - MAY 12: Smoke billows after Saudi-led coalition airstrikes hit the Houthi targets in Yemeni capital Sanaa on May 12, 2015, as Saudi Arabia and its Arab allies continue to launch military campaign targeting Houthi positions across Yemen. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)