Do riots in a Rio favela mean the pre-World Cup pacification efforts failed?

There were violent clashes in Rio de Janeiro Tuesday night just weeks before the city and the rest of Brazil play host to the World Cup soccer tournament, leading many wondering if Rio will be safe and ready for the marquee even

A resident gestures during a protest against the death of a man in Pavao-Pavaozinho slum, in the Copacabana neighborhood in Rio de Janeiro April 22, 2014. Residents have accused Police Peacekeeping Unit officers of causing death of a 25-year-old dancer
A resident gestures during a protest against the death of a man in Pavao-Pavaozinho slum, in the Copacabana neighborhood in Rio de Janeiro April 22, 2014. Residents have accused Police Peacekeeping Unit officers of causing death of a 25-year-old dancer