A frightening, fiery crash sent Kyle Larson's car airborne and debris spinning into the stands, injuring dozens of race fans at the Nascar stock car Nationwide Series season- opener.
Joie Chitwood, president of Daytona International Speedway, said 14 injured fans were transported from the circuit for treatment at local hospitals and 14 more were treated at the track's medical facility.
He said he could not confirm reports that at least two people were seriously hurt and that one was taken immediately for surgery.
Various media reports put the number of injured at more than 30, with ESPN reporting that one adult had life-threatening head trauma and a 14-year-old was in critical condition in hospital.
The wreck, which occurred almost as Tony Stewart was taking the checkered flag for victory, began when race leader Regan Smith turned sideways and a dozen cars bunched behind him.
Larson, who was making his first start in Nascar's second-tier series, was launched into the catch-fencing.
The incident came on the eve of the season-opening event in Nascar's top-flight Sprint Cup series, the Daytona 500.