A day after the deadliest police operation in Brazil's history, the country is still piecing together details about the raid against a powerful drug gang in Rio de Janeiro's favelas.

The official death toll stands at 119, including four police officers, after a massive operation that again exposed the violent underbelly far from the city's tourist attractions.

This is what we know, and don't know:

– Target: Comando Vermelho –

The operation, dubbed Operation Containment, aimed to weaken the Comando Vermelho (Red Command), Rio's oldest and most powerful criminal group that has expanded rapidly in recent years, according to authorities.

Some 2,500 heavily armed officers backed by armored vehicles, helicopters and drones on Tuesday invaded two key strongholds of the gang -- the sprawling

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