A resident of Jacarezinho slum who lives in a street where at least 3 men were killed by the police, walks in an alley where a mattress is seen full of blood from an operation hours before at the favela in the north zone of Rio de Janeiro. The police raid in Jacarezinho Slum left 29 people killed, being the most violent operation in Rio de Janeiro's history. A bloody, hours-long gun battle here echoed in the Favela, with authorities saying the police mission killed two dozen criminals while residents and activists claimed human rights abuses.