Through much of yesterday morning, heavy exchanges of gunfire terrorised residents of Rocinha, Rio's biggest favela with 75,000 inhabitants.
Nearly a quarter the city's 6.45 million population live in favelas, the term Brazilians give for the poor, densely populated neighbourhoods clustered on the city's steep hillsides.
"Clashes between traffickers in Rocinha. Avoid the area," Rio's military police warned on the force's Twitter account.
Local security services told AFP that one person was killed in Rocinha yesterday, the day after five other people were killed in neighbourhoods north of the city.
Several helicopters overflew the area and entrances to a metro station at Sao Conrado -- a wealthy neighbourhood in southern Rio below Rocinha -- was closed for several hours.
Police also were attacked in the early morning by a group of heavily armed men near the favela, according to the authorities.
A police source told AFP that they suspect the violence was due to internal divisions in the gang that controls drug trafficking in Rocinha.
Firefighters confirmed that they recovered five bodies from that area, while the local press put the toll there at seven dead.
Rio has seen deadly violence spiked during the first half of the year to its highest level since 2009, with 3,457 homicides, a 15 percent jump from the same period last year, according to the Public Security Institute.
The growing sense of insecurity has been aggravated by the state of Rio's dismal financial situation. On the verge of bankruptcy, it is a month behind in payments of wages and salaries to its workers, including the police.
They have already taken part in two huge operations against the armed gangs in the city's favelas.
The newspaper O Globo, however, reported that the military has not taken part in the last two operations led by local authorities and the troops may soon be pulled out of the city.
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