"When Rio was awarded the 2016 Olympic Games in 2009, authorities promised to improve security for all. Instead, we have seen 2,500 people killed by police since then in the city and very little justice," Amnesty International Brazil Director Atila Roque said.
He added that police violence resulted in surge of homicides and large-scale violations of human rights during police raids ahead of and during the 2014 World Cup.
"Brazil seems to have learned very little from the great mistakes it made over the years when it comes to public security. The policy of ‘shoot first, ask questions later’ has placed Rio de Janeiro as one of the deadliest cities on earth," Roque stressed.
Brazilian city of Rio set to host 2016 Summer Olympic Games in August 5-21 has been exposed to a number of challenges, including high insecurity and recent outbreak of Zika virus disease.