Brazil plans to deploy around 60,000 security forces for the 2016 Olympic Games in Rio de Janeiro amid fears of a spike in violence in the picturesque city.
The security operation would be larger than the 40,000 deployed for the 2012 Games in London, but smaller than the 75,000 used in Athens in 2004 when organisers worried about terrorism following the September 11 attacks in New York three years earlier.
The source, who the news agency Reuters granted anonymity because the information is not yet public, said federal and state governments and the organising committee are still hammering out details of the operation that will include military troops, police, firemen and private security agents.
Unlike when the city hosted the 2007 Pan-American Games, authorities are not considering sending troops to the favelas, or hillside slums, known for drug violence as "security has improved substantially in Rio," said the source.
However, a rash of stabbings and shootings as well as a climb in robbery across the city has rekindled security concerns after years of progress in clamping down on crime.
Rio has invested heavily to bolster its police force, particularly in the favelas where heavily armed drug gangs have ruled for years.