A minimum of 64 civilians were killed in a police operation against the criminal organization Comando Vermelho in Rio de Janeiro's northern suburbs - the largest and deadliest raid in the area's history.
Four security agents lost their lives during Operation Containment in the Alemão and Penha districts, local authorities said. In excess of 80 suspects were taken into custody.
Intense confrontations erupted when about 2,500 police forces entered the area on the morning of the operation. The Red Command responded with gunfire, igniting obstacles and launching explosives via unmanned aircraft, police representatives stated.
The International human rights organization said it was "shocked" by the security action, urging "immediate and thorough inquiries".
The area of favelas near the city's international airport is regarded as the central command of one of Brazil's most powerful illegal networks.
Government representatives stated a minimum of 50 of the deceased were "classified by law enforcement as potential lawbreakers".
Numerous individuals were hurt, including innocent bystanders trapped in shooting.
Locals have likened the elevated neighborhood - housing around 300,000 individuals - to a "combat area" since the mission commenced.
Transport routes stay blocked in the entire neighborhood.
The Comando Vermelho organization has been increasing their territory across the Rio state, increasing drug trafficking routes and power in the informal settlements.
Security forces stated over 200kg (441lb) of illegal substances were captured in the raid, along with multiple guns.
The joint operation by different law enforcement agencies follows a extended probe.
Numerous alleged criminals are considered participants in an organization from the Pará state who are presently concealed in the city.
Extensive security missions are frequent in the South American nation before major international events in the nation.
The international environmental meeting the environmental summit is taking place in the northern urban center in the eleventh month.
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