A figure symbolizing missing people is pictured during a ceremony at “La Escombrera” rubbish dump in Medellin, Colombia July 27, 2015. Colombian authorities began on Monday to unearth what they say is the world's largest urban mass grave, located in the garbage tip in a sprawling mountainside slum known as Comuna 13 in western Medellin. (Photo by Fredy Builes/Reuters)
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