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Brazilian police are preparing to occupy one of the deadliest shantytown complexes in Rio de Janeiro, hoping to drive out drug gangs ahead of next year's World Cup and the 2016 Olympics.

It's the latest "pacification" effort in a Rio slum, and the city's new chief of police says he'll need some 1,500 cops to secure this one, called Mare.

Police in the past would typically stage raids, but then withdraw from the dangerous shantytowns, known here as favelas. But under the pacification program, they now set up shop inside the favelas.

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