Rio won the games by 66 votes to 32 in a third round ballot in an IOC vote in 2009, after initially losing the first round of voting to Madrid.
'Large corruption racket'
A French financial prosecutor statement confirmed on Tuesday that the son of the International Association of Athletics Federations (IAAF) president, and influential members of the IOC, were at the centre of an investigation into a "large corruption racket".
"There are several consistent indications that payments have been made in return for the votes of IAAF and International Olympic Committee members over the designation of host cities for the biggest global sporting events," the statement said.
Brazilian police said on Tuesday that 70 police officers, joined by French officials, had conducted of search and seizure operations at 11 sites.
There was no immediate comment from Mr Nuzman on Tuesday. A spokesman for the Rio Olympics declined to comment to Reuters news agency on the police raids.
In a statement, the IOC said: "The IOC has learned about these circumstances from the media and is making every effort to get the full information. It is in the highest interests of the IOC to get clarification on this matter."