No one was injured, but a TVNZ report said the bullet narrowly missed a New Zealand team official who was badly shaken by the incident yesterday.
Rio 2016 chief spokesman Mario Andrada said authorities were carrying out ballistics tests to determine what kind of round was used and where it was fired from.
"The bullet came from outside and technical experts from the local police are investigating all relevant traces like distance and direction and the type of the bullet," Andrada said.
"Security around the area is in place. It was an unfortunate incident. As soon as more information is available it will be disclosed immediately."
New Zealand's Olympic team said the bullet had been "unintentionally fired" and landed on the media centre floor.
"The New Zealand police assessment is that the bullet was fired unintentionally rather than with intent," the statement said.
"We have advised all team members to remain within the accredited areas at the venue and travel bubble to bubble. Team members should remain aware and exercise caution."
Rio is notorious for gun crime and there were two fatal shootings near Olympic venues on Friday, including one outside the Maracana stadium where the opening ceremony took place.
On Saturday, bomb-disposal experts carried out a controlled explosion near the finish line of the cycling road race at Copacabana beach.
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