Recent violence in Rio de Janeiro's favelas have raised security concerns for the 2016 Olympic Games. From NPR:
Just weeks after Rio de Janeiro was awarded the 2016 Olympics, a deadly outburst of violence descended on the Brazilian city. Warring drug gangs left two dozen people dead, including three police officers whose helicopter was shot down with a high-powered rifle.
The gang warfare garnered headlines worldwide and raises questions about Rio's ability to control the relentless violence that for years has plagued the city's sprawling slums and sometimes spilled down into its famous tourism districts.