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ANGELS CAMP, Calif.—State investigators were trying to determine what caused a spinning carnival ride at a county fair to collapse and injure all 24 people aboard.

The carnival ride, called the Yo-Yo, collapsed shortly after 6 p.m. Friday at the Calaveras County Fair and Jumping Frog Jubilee, southeast of Sacramento.

The ride has metal arms, each with a seat at the end attached by a chain, that swing outward as the ride picks up speed. The arms rise and fall as they spin around a center pole, putting the seats horizontal to the ground.

The pole apparently collapsed, causing the arms to crash back toward the center, said Dennis Townsend, a chief in the Calaveras County unit of the California Department of Forestry and Fire Prevention.

The riders—mostly children—were hurt when their seats struck the ground or other parts of the machine, he said.

Three riders were airlifted to hospitals in Modesto and Sacramento, but the extent of the injuries was not immediately known.