Two policemen were arrested Tuesday in the killing of Brazilian black activist Marielle Franco, news reports said.
These are the first arrests in a case that shocked Brazil.
Franco was a left-leaning Rio city councillor who grew up in a slum and went on to become a respected defender of blacks, the poor and the LGTB community.
She was killed a year ago in a drive-by shooting, along with her driver, Anderson Gomes.
Franco was also an outspoken critic of police violence against poor people.
News website G1 reported the arrests, quoting homicide police.