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The daredevil pair suffered serious injuries when their bikes collided inside the 15ft circular steel mesh cage.

The accident happened around 30 seconds into their act during a performance of Uncle Sam’s Great American Circus in a packed big top tent.

Members of the audience gasped and screamed as they fell to the base of the cage in the tent on Bank Holiday Monday at Chantry Park, Ipswich, Suffolk.

The circus posted a statement on its Facebook page saying: "To all our audience from the 4.30pm show today, we would just like to thank you all for your support during the accident with our thunderball riders.

"We have just had an update from Ipswich Hospital and both are doing well and stable, soon to be on the mend.

"We want to thank you for your understanding as we had to cut short the show. However our riders' safety was, and is, our main priority."