Human Rights Watch, 07/11/2016
Police in the state of Rio de Janeiro have killed more than 8,000 people in the past decade, including at least 645 people in 2015. One fifth of all homicides in the city of Rio last year were police killings. Three quarters of those killed by police were black men.
The Rio police report nearly all such killings as legitimate acts of self-defense in response to attacks by suspected criminals. Given that police in Rio often face real threats of violence from heavily-armed gangs, many of these killings are likely the result of the legitimate use of force.
Many others, however, are in reality extrajudicial killings. Police shoot at unarmed people. They shoot people in the back as they are fleeing. They execute people who have been detained with a bullet to the head.