RIO DE JANEIRO — Rio de Janeiro authorities said on Friday they had identified most of those killed in the deadliest police operation in Brazil’s history, as protesters denounced the high number of casualties in the military-style raids.

The operation on Tuesday targeted the Comando Vermelho gang that controls the drug trade in several favelas — poor, densely populated neighborhoods woven through the city’s hilly terrain. The raids killed 121 people, including four police officers. Felipe Curi, secretary of Rio’s civil police, told reporters that by Friday morning, 99 of the dead had been identified. Of those, 42 had outstanding arrest warrants and 78 had prior criminal records, he said.

State officials have been describing the operation as a success, with Governor Claudio Castro saying

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