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Yemeni protesters burn a portrait of Shiite Huthi movement's leader Abdul-Malik al-Huthi during a rally against the control of the capital by Huthi rebels on January 24, 2015 in the capital Sanaa. Thousands of Yemenis took to the streets of Sanaa in the largest demonstration against Huthis since the Shiite militiamen overran the capital in September. "Down, down with the Huthis' rule," chanted the protesters who rallied following a call by the Rejection Movement -- a group recently formed in provincial areas to challenge the powerful militia. AFP PHOTO / MOHAMMED HUWAIS (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)

Yemeni protesters burn a portrait of  Shiite Huthi movement's leader Abdul-Malik al-Huthi during a rally against the control of the capital by Huthi rebels on January 24, 2015 in the capital Sanaa. Thousands of Yemenis took to the streets of Sanaa in the largest demonstration against Huthis since the Shiite militiamen overran the capital in September.  "Down, down with the Huthis' rule," chanted the protesters who rallied following a call by the Rejection Movement -- a group recently formed in provincial areas to challenge the powerful militia.   AFP PHOTO / MOHAMMED HUWAIS        (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)