At least 33 NASCAR fans were injured when a car flew into the fence at Daytona International Speedway, hurling a tire and large pieces of debris into the stands.

The accident happened on the last lap of the second-tier Nationwide Series race on the eve of today’s Sprint Cup season-opening Daytona 500, which officials said would go on as scheduled.

The crash began as the field approached the checkered flag and leader Regan Smith attempted to block Brad Keselowski to preserve the win. That triggered a chain reaction, and rookie Kyle Larson hit the cars in front of him and his car was went airborne into the fence.

The entire front end was sheared off Larson’s car, and his burning engine wedged through a gaping hole in the fence.

Chunks of debris from the car were thrown into the stands, including a tire that cleared the top of the fence and landed midway up the spectator section closest to the track.

The 20-year-old Larson stood in shock several yards away from his car as fans in the stands waived frantically for help. Smoke from the burning engine briefly clouded the area, and emergency vehicles descended on the scene.

Ambulance sirens could be heard wailing behind the grandstands at a time the race winner would typically be doing celebratory burnouts.

“It was freaky. When I looked to my right, the accident happened,” said fan Rick Harpster, who had a bird’s-eye view of the wreck. “I looked over and I saw a tire fly straight over the fence into the stands, but after that I didn’t see anything else That was the worst thing I have seen, seeing that tire fly into the stands. I knew it was going to be severe.”

Shannan Devine was sitting about 250 feet away from where the car smashed into the fence and could see plumes of smoke directly in front of her.

“I didn’t know if there was a car on top of people. I didn’t know what to think. I’m an emotional person and I immediately started to cry. It was very scary. Absolutely scary. I love the speed of the sport. But it’s so dangerous,” said Devine who was planning to attend her second Daytona 500.

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