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Kyle Larson (32) crashed into the catch fence at the end of the NASCAR Nationwide Series at Daytona International Speedway.

John Raoux/AP

Pieces of Larson's car flew through the air and into the stands.

David Graham/AP

Injured spectators were treated after debris flew into the stands.

PIERRE DUCHARME/Reuters

Rescue workers attended to the injured in the stands.

BRIAN BLANCO/Reuters

Rescue workers stood next to a hole in the catch fence following the crash.