The 2016 Olympics are a long way off, but recurring violence has raised questions about the recent selection of Rio de Janeiro. During a shootout this weekend, 29 people were killed, including three policemen in a helicopter downed by gunfire. Today, Brazilian President Luiz Inácio Lula da Silva promised a crackdown in the hillside shanty towns, called favelas, above the city. John Lyons is there for the Wall Street Journal.
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