Police were met with gunfire in the Minha Deusa (My Goddess) favela, or shantytown, a spokeswoman said. Officers seized machineguns, grenades, five stolen cars and drugs.
Earlier this week, a street vendor and a motorist were shot dead in botched police operations in the famed tourist city.
Brazilians were outraged this month when two police officers killed a 3-year-old boy by firing on the car his mother was driving, thinking it was the getaway vehicle of criminals.
The number of suspects killed last year by police rose 25 percent to 1,330.
Governor Sergio Cabral has said his policy of confrontation is needed to counter the heavily armed drug gangs that control the slums.
Republished permission FOCUS Information Agency
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