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A Special Police Operations Battalion (BOPE) officer is chased by a barking dog during an operation in the Mare slum complex, ahead of its "pacification," in Rio de Janeiro, Brazil, Wednesday, March 26, 2014. Elite federal police and army troops will be sent to the city to help quell a wave of violence in so-called "pacified" slums. Recent attacks on police bases in the favelas is raising concerns about an ambitious security program that began in 2008, in part to secure the city ahead of this year's World Cup and the 2016 Olympics. (AP Photo/Silvia Izquierdo)
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Special Police Operations Battalion (BOPE) officers stand guard, as army soldiers look for weapons with the aid of a metal detector during an operation in the Mare slum complex, ahead of its "pacification," in Rio de Janeiro, Brazil, Wednesday, March 26, 2014. (AP Photo/Silvia Izquierdo)
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A Special Police Operations Battalion (BOPE) officer takes position during an operation in the Mare slum complex, ahead of its "pacification," in Rio de Janeiro, Brazil, Wednesday, March 26, 2014. (AP Photo/Silvia Izquierdo)
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Policemen of Special Operations Battalion (BOPE) take position as a resident walks at the Mare slums complex in Rio de Janeiro, March 30, 2014. REUTERS/Sergio Moraes
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A Special Police Operations Battalion (BOPE) officer walks beside a bullet pocked wall during an operation in the Mare slum complex, ahead of its "pacification," in Rio de Janeiro, Brazil, Wednesday, March 26, 2014. (AP Photo/Silvia Izquierdo)
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Policemen of Special Operations Battalion (BOPE) patrol at the Mare slums complex in Rio de Janeiro, March 30, 2014. REUTERS/Sergio Moraes
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A Special Operations Battalion (BOPE) police officer looks on while on a patrol at the Mare slums complex in Rio de Janeiro March 30, 2014. REUTERS/Sergio Moraes
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A sniper of Special Operations Battalion (BOPE) takes position at the Mare slums complex in Rio de Janeiro, March 30, 2014. REUTERS/Sergio Moraes