At least 21 people have died in a wave of violence between police and gang members in Brazil's Rio de Janeiro. Thousands of officers have been dispatched to deal with gunmen who have been blocking main roads, robbing motorists and burning cars since Sunday. Officials say drug traffickers are fighting back against police operations aimed at tackling violence in city slums. Brazil's pacification programme plans to improve security in the run-up to the 2014 World Cup.
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