Public safety officials in Rio de Janeiro say a blast heard near the finish line of the men's Olympic cycling road race on August 6 was a controlled explosion of an unattended bag. 

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Members of a bomb squad team in protective clothing were operating at the site after the blast and a half dozen military police cordoned off the area.

The explosion shook the ground near the finish line as the cyclists had about 70 kilometers remaining in their race.

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The race was allowed to continue and was not rerouted.

No one was immediately evacuated and there were no apparent injuries.

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In recent days, bomb squads have detonated several unattended bags using controlled explosions in Rio.