RIO DE JANEIRO - Brazil will deploy federal troops to Rio de Janeiro to help quell a surge in violent crime following attacks by drug traffickers on police posts in three slums on the north side of the city, government officials said on Friday.



Less than three months before Rio welcomes tens of thousands of foreign soccer fans for the World Cup, the attacks cast new doubts on government efforts to expel gangs from slums using a strong police presence. The city will host the Olympics in 2016.



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