The platform was under an announcer's box at the suburban Columbus Motor Speedway.
The fire department says five people were injured when the platform fell just hours before the track was to open its season Saturday night.
The wife of one of the track's co-owners says the five people sustained cuts but no other injuries. Cindy Nuckles says track officials have no idea why the platform fell.
A buildings inspector is expected to examine the area.
The track's racing program of NASCAR Whelen All-American Series Late Models, Columbus Modifieds, Sport Stocks and Crazy Compacts has been postponed.
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