A massive police raid targeting a drug-trafficking gang in Rio de Janeiro left at least 121 people dead, authorities said Thursday morning.

More than 40 dead bodies were seen on a street in Rio de Janeiro's Penha favela complex early on Wednesday, according to a Reuters witness, a day after the most lethal police operation in the city's h...

Non-governmental organizations and the U.N. human rights body quickly raised concerns over the high number of reported fatalities and called for investigations.