Shiite rebels hold posters of late Shiite cleric Nimr al-Nimr at a protest Thursday in Sanaa, Yemen. The cleric's execution by Saudi Arabia on Saturday sparked a dramatic deterioration in relations between Saudi and Iran. Hani Mohammed/AP hide caption

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Yemeni men clear debris following an airstrike by the Saudi-led coalition in the capital, Sanaa, on Nov. 29. Mohammed Huwais/AFP/Getty Images hide caption

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Human Rights Groups Criticize U.S. Arms Sale To Saudi Arabia
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People stand amid the rubble of a house damaged by a Saudi-led airstrike last month in the old city of Sanaa, Yemen's capital. Hani Mohammed/AP hide caption

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U.S.-Backed Saudi Bombing Campaign Blamed For Civilian Deaths In Yemen
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