In this photo taken April 6, 2012, police patrol Rocinha slum in Rio de Janeiro, Brazil. Setbacks in a security program meant to take back territory from the drug trade have shown the immense challenge of pacifying the city’s violent slums and raised questions about the state's ability to keep the peace as Rio prepares to take the world stage not just for the Olympics but the 2014 World Cup, which will host its headline events in Rio. (AP Photo/Felipe Dana)
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