At least 18 suspects and several police officers were killed Tuesday during a massive anti-drug raid in Rio de Janeiro, Brazilian authorities said.

"So far, we have 56 arrests and 18 criminals neutralized," Rio State Governor Claudio Castro told a press conference.

He described the operation, which involved 2,500 officers and targeted a suspected drug-trafficking ring at a favela in Rio, as the "largest in the history" of the state.
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