It took firefighters 30 minutes to rescue three people from a ferris wheel at La Ronde Wednesday.
It happened at 7 p.m. at the amusement park.
Officials say two cabins flipped upside down as they hung about seven metres off the ground. First responders used a ladder to get to the three ride-goers.
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Firefighters believe equipment used for a film shoot could have created an imbalance, causing the gondolas to flip.
There were no reported injuries.