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Houthi rebels fighters chant slogans as they take off to a battlefront following a gathering aimed at mobilizing more fighters for the Houthi movement, in Sanaa, Yemen, Thursday, Aug. 1, 2019. The conflict in Yemen began with the 2014 takeover of Sanaa by the Houthis, who drove out the internationally recognized government. Months later, in March 2015, a Saudi-led coalition launched its air campaign to prevent the rebels from overrunning the country’s south. (AP Photo/Hani Mohammed)