At least 28 fans have been injured in a multi-car crash during a Nascar race at Daytona in the American state of Florida.
Large pieces of debris, including a tyre, flew into the spectator stands when one of the cars hit a fence separating the track from the seats.
Race officials say 14 people had to be treated in hospital.
The BBC reports the accident happened on the eve of the Dayton 500 - one of the most famous Nascar events. The officials later said the main race would go ahead.