The cause of the crash wasn't immediately known, but an official with the event said there were indications that mechanical problems were at play.
The plane, flown by a renowned 74-year-old air racer and movie stunt pilot, spiraled suddenly out of control and appeared to disintegrate upon impact. Bloodied bodies were spread across the area as people tended to the victims and ambulances rushed to the scene.
Maureen Higgins of Alabama, who has been coming to the show for 16 years, said the pilot was on his third lap when he lost control.
She was sitting about 30 yards away from the crash and watched in horror as the man in front of her started bleeding after a piece of debris hit him in the head.
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