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Photo: The Canadian Press. All rights reserved.

Daytona International Speedway president Joie Chitwood III, left, speaks at news conference with Steve O'Donnell, NASCAR senior vice president, after numerous spectators were injured when driver Kyle Larson's car crashed in a catch fence on the last lap of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, in Daytona Beach,  (AP Photo/Terry Renna)

At least 33 fans were injured Saturday during a NASCAR race 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 Sunday's 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 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.