A minimum of 64 individuals lost their lives in a security raid cracking down on the Red Command gang in Rio de Janeiro's northern districts - the most extensive and fatal action in the Brazilian state's records.
Four law enforcement personnel were among those killed during the police action in the Alemão and Penha districts, government representatives reported. Over 80 suspects were taken into custody.
Violent conflicts commenced when about 2,500 security personnel initiated the operation on Tuesday morning. The Comando Vermelho responded with armed resistance, setting fire to barriers and launching explosives via unmanned aircraft, officials said.
The UN Human Rights Office stated it felt "shocked" by the law enforcement raid, demanding "prompt and effective investigations".
The slum neighborhoods close to Rio's airport is regarded as the central command of a major criminal organizations.
Local authorities confirmed at least 50 of the fatalities were "indicated by police as suspected of being criminals".
Many residents were injured, including civilians caught in the crossfire.
Residents have likened the hillside area - home to about 300,000 individuals - to a "combat area" since the raid started.
Access ways continue shut across the area.
The Comando Vermelho organization have been expanding their influence in the area, growing illegal substance trade paths and dominance over the slum communities.
Security forces said in excess of 200kg (441lb) of illegal substances were captured in the operation, together with dozens of firearms.
The joint operation by various security forces comes after a extended probe.
Dozens of the suspects are considered members of a faction from the Pará state who are presently concealed in the metropolitan area.
Major law enforcement actions are not uncommon in the South American nation prior to major international events in the nation.
The international environmental meeting COP30 is set to occur in the northern city of Belem in November.
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