At least 64 individuals died in a law enforcement action targeting the Red Command gang in the Brazilian city's northern suburbs - the biggest and most lethal operation in the region's past.
Four law enforcement personnel lost their lives during the security mission in the neighborhoods of Alemão and Penha, state officials stated. Over 80 suspects were arrested.
Violent conflicts broke out when around 2,500 law enforcement officers initiated the operation on the morning of the operation. The criminal organization countered with gunfire, igniting obstacles and dropping bombs from drones, authorities stated.
The International human rights organization said it was "shocked" by the law enforcement raid, urging "swift and comprehensive examinations".
The area of favelas close to Rio's airport is seen as the headquarters of a major organised crime groups.
Government representatives confirmed at least 50 of those killed were "classified by law enforcement as potential lawbreakers".
Dozens of people were hurt, including non-combatants affected by the violence.
Locals have compared the elevated neighborhood - inhabited by approximately 300,000 residents - to a "battlefield" since the operation began.
Roads remain closed across the area.
The Comando Vermelho organization have been expanding their territory across the Rio state, expanding narcotics distribution networks and control of the hillside favelas.
Security forces said in excess of 200kg (441lb) of illegal substances were confiscated in the raid, together with dozens of firearms.
The coordinated mission by civil and military police follows a twelve-month inquiry.
Numerous alleged criminals are believed to be affiliates of a group from the Brazilian state who are currently hiding in the city.
Major law enforcement actions are frequent in Brazil before significant global gatherings in the country.
The international environmental meeting COP30 is set to occur in the city of Belem in the north in November.
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