It appears that the local bomb squad showed up and performed a controlled explosion to detonate an "unattended bag".
The blast was heard near the finish line of the Rio Olympics cycling course.
Meanwhile, a bomb squad is investigating after an apparent blast shook the area near the finish line of the men's cycling road race.
"There is no impact to the race, which is ongoing".
Sky News' Paul Kelso said he heard a "very loud bang" from behind a grandstand. Officials say the bag may have belonged to a homeless man, but they had to take precautions.
It's been an eventful first two days for the Rio Olympics, but probably not in the way organizers were hoping.
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| Bomb squard investigating blast at Olympics |
We will update this post as more information becomes available.
Another incident saw spectators leaving Friday's opening ceremony confronted by the body of a man shot dead near the Maracana Stadium. They then saw the shooter running into a nearby vehicle and driving off.
Britain's Adam Peaty set a world record of 57.55 seconds in the men's 100 metres breaststroke heats on Saturday, beating his own mark of 57.92 set in London past year.
