In this Thursday, April 14, 2016 photo, Smoke rises above a controlled land mine, which was detonated by Russian experts, in the ancient town of Palmyra in the central Homs province, Syria. Cluster munitions, land mines, and other unexploded ordinances are killing Syria's civil defense volunteers as they work to make battle-torn areas safe for civilians to return. (AP Photo/Hassan Ammar)
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