(CNN) — At least 64 people have died in a massive police raid aimed at organized crime in Rio de Janeiro on Tuesday, security officials told CNN Brasil . Among the dead are four Brazilian police officers, officials added.

Video obtained by CNN Brasil show several fires in the area of the raid, with audible gunfire in the background.

Authorities launched an operation aiming to “combat the territorial expansion” of the Comando Vermelho criminal group, Rio de Janeiro’s government added in a lengthy thread on X. The operation was in the works for over a year, the government said, and involved more than 2,500 military and civilian police personnel.

Comando Vermelho (CV) is Brazil’s oldest active criminal organization, according to the think tank InSight Crime . Its name, Portuguese for

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