Ten people have been killed and about 50 schools have been shuttered over the past nine days, the O Globo newspaper reported today.
Police would not immediately confirm the death toll, but said they had deployed 27 battalions of military police to various areas, including downtown and the touristy southern area of the city.
Nicolas Labre Pereira, nicknamed "Fat Family," was freed on June 19 when assailants stormed one of the hospitals recommended for tourists traveling to the Olympic Games. The raid to free the 28-year-old suspect left a patient dead and a nurse and an off-duty policeman wounded.
Last weekend, an off-duty bodyguard for Rio's mayor was shot dead in an apparent mugging and a 34-year-old doctor was killed in her car on a main expressway. Earlier this month, members of the Australian Paralympic team were mugged at gunpoint.
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An estimated 85,000 police and soldiers will be patrolling the streets during the Olympics and Paralympics, but Rio de Janeiro's acting governor says the state is still waiting for a 2.9 billion Brazilian real (USD 860 million) payout from the federal government that is earmarked for security efforts.
Killings have increased this year from 1,818 to 2,036 in the first four months compared to the same months in 2015, according to a state tally that counts murders, officer-involved deaths and deaths as a result of robberies.