ANGELS CAMP, Calif. (AP) -- A spinning carnival ride collapsed at a fair near Sacramento, California, last night, injuring all 24 people on board.

Three of the riders had to be airlifted to hospitals but some of the injuries do not appear to have been serious. The ride, called the Yo-Yo, collapsed at California's Calaveras County Fair and Jumping Frog Jubilee. Most of the riders were children.

The ride has metal arms extending out from a pole at the center. Each has a seat attached and they go up and down as the ride spins. An emergency official says the pole collapsed and the seats hit the ground or other parts of the machine.

California accident investigators will be trying to pinpoint the cause.