ANGELS CAMP, Calif. -- A carnival ride collapsed Friday evening at the Calaveras County Fairgrounds, injuring 18 people. A swing ride called the Yo-Yo collapsed just after 6 p.m., Cal Fire's Lisa Williams said. According to witnesses, 25 people were on the ride at the time. The Yo-Yo has arms that fling out as they spin around an axis, said Dennis Townsend, a chief in the Calaveras County unit of the California Department of Forestry and Fire Prevention.