The accident happened just after 4 p.m., a Scott County dispatcher said.
Thirteen people were taken to St. Francis Regional Medical Center in Shakopee for treatment, a hospital official said.
Eleven were admitted for treatment of injuries, and two were dismissed, authorities said. The rest were listed in stable condition.
Most of the injuries were minor, and all 11 were expected to be OK, a supervising nurse said.
The nature of the accident has not yet been confirmed.
The Wild Thing debuted at Valleyfair in 1996, according to the amusement park's Web site. The ride lasts three minutes and reaches speeds of 74 mph.
The coaster's track is nearly 5,500 feet long and peaks at 207 feet high. It features two "S" curves, one tunnel and one 360-degree spiral. This link will provide you with photo's of the derailed coaster train.http://www.themeparkreview.com/forum/viewtopic.php?t=25255