The extraordinarily bloody episode shocked Rio, a city that is no stranger to scenes of gangs battling the police and each other. It also rattled Brazil just as the Latin American nation prepares to welcome delegations from around the world for the UN climate change conference, with events planned in Rio and the Amazonian city of Belem.

Rio de Janeiro has been gripped by some of its fiercest urban violence in years after large-scale police operations against the Comando Vermelho (Red Command) criminal organization ignited running gun battles,

Bodies piled up in poor neighborhoods of Rio de Janeiro on Tuesday as police launched their biggest ever raids on the city's drug traffickers, leaving at least 64 dead in war-like scenes.As many as 2,