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Huthi rebels, dressed in army fatigues, chant slogans during a gathering in the capital Sanaa to mobilize more fighters to battlefronts to fight pro-government forces in several Yemeni cities, on January 1, 2017. / AFP / Mohammed HUWAIS (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)

Huthi rebels, dressed in army fatigues, chant slogans during a gathering in the capital Sanaa to mobilize more fighters to battlefronts to fight pro-government forces in several Yemeni cities, on January 1, 2017. / AFP / Mohammed HUWAIS        (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)