Updated

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.

The final-lap accident Saturday marred the second-tier Nationwide Series race on the eve of a spectacle often called the Super Bowl of motorsports. Late into the night, track workers were scrambling to repair a huge section of fence that separates fans from the high-speed track.

Speedway President Joie Chitwood III has a news conference scheduled for Sunday morning to give the latest update on repairs and any safety changes that could be made before the "Great American Race."