“The velodrome suffered damage to the roof, but there is no structural risk,” Rio’s fire department said in a statement.

The cycling track was not damaged in the fire, which was caused by a falling balloon.

The practice of making small hot air balloons is a common one in Brazil and authorities have launched annual campaigns to criminalize the practice.

Flying balloons can hamper aircraft and falling balloons can damage property and start forest fires.

A similar falling lantern caused damage to the roof and track - which is made from special pinewood only found in Siberia - in July.

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