Brazilians mourn slain politician and demand justice for her death

Thousands demonstrated in Rio Thursday after the killings of Marielle Franco and her driver.

(CNN)Thousands of angry and distraught Brazilians have taken to the streets to protest and mourn the shooting death of Marielle Franco, a Rio de Janeiro councilwoman and a prominent critic of police killings in shantytowns.

Franco and her driver Anderson Pedro Gomes were killed Wednesday night in Rio's Estacio neighborhood when a car pulled up beside them and someone inside shot at them. A press secretary who worked for Franco was sitting the back seat and was injured.
Political violence is not an uncommon phenomenon in Brazil. It usually erupts in smaller and more impoverished cities.
    In Rio, violence has risen and weeks ago, the federal government decreed that Brazil's army would take over all security operations through the end of the year to tackle that problem.
    Franco slammed the federal government's move, saying it could aggravate police violence against residents. She had been appointed rapporteur for a special commission to monitor the federal intervention.

    Widespread outrage

    Brazilian President Michael Temer called the killings a "cowardly attack" and called for an investigation. Human rights activists also denounced the deaths of Franco and her driver.
    Marchers took to the streets in Rio, Sao Paulo and other cities.
    Demonstrators rally in Sao Paulo after the killings.
    At Rio's City Council building, Franco's body briefly lay in state. More vigils and protests are being planned.