At least 64 people lost their lives in a police operation against the organized crime group in Rio de Janeiro's northern districts - the largest and deadliest raid in the region's records.
Four police officers were among those killed during the security mission in the neighborhoods of Alemão and Penha, state officials reported. More than 80 suspects were arrested.
Fierce clashes commenced when about 2,500 security personnel moved in on the morning of the operation. The Comando Vermelho reacted using shooting, setting fire to barriers and using drone-dropped explosives, officials confirmed.
The UN Human Rights Office stated it felt "shocked" by the police operation, calling for "prompt and effective investigations".
The informal settlements close to the aerial transportation hub is regarded as the main base of a major organised crime groups.
Government representatives stated at least 50 of those killed were "indicated by police as suspected of being criminals".
Many residents were wounded, including civilians caught in the crossfire.
Community members have compared the mountainous region - home to about 300,000 people - to a "battlefield" since the raid started.
Roads remain closed in the entire neighborhood.
The Red Command group has been growing their territory across the Rio state, expanding narcotics distribution networks and control of the hillside favelas.
Security forces reported more than 200kg (441lb) of drugs were seized in the mission, along with dozens of firearms.
The joint operation by various security forces was preceded by a twelve-month inquiry.
Numerous alleged criminals are considered members of a faction from the Pará state who are currently hiding in the metropolitan area.
Large-scale police operations are regular in the country prior to significant global gatherings in the nation.
The United Nations climate conference the environmental summit is scheduled in the city of Belem in the north in the eleventh month.
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