In "City of God, Guns & Gangs," Vanguard correspondent Mariana van Zeller investigates Brazil's controversial new plan to wipe out crime, and the criminals themselves, from Rio de Janeiro's favelas before the country hosts the 2014 World Cup and 2016 Olympics. We go into the heart of a crack den, embed with special forces soldiers on shoot to kill missions, and even interview the traffickers themselves, who aren't going out without a fight. Produced by Alex Simmons, Darren Foster and Mariana van Zeller

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