DAYTONA BEACH, Fla. (AP) — With the start of the Daytona 500 just hours away, NASCAR officials still have some cleaning up to do amid growing questions about fan safety.

The season opener will go off as planned Sunday less than 24 hours after at least 33 people were injured when a car flew into the fence during a NASCAR race at Daytona International Speedway, sending a tire and large pieces of debris sailing into the stands.

"Just seeing the carnage on the racetrack, it was truly unbelievable," driver Justin Allgaier said.