Six Flags shares are lower after an accident at the company's Louisville, Ky., amusement park.
Late Thursday, a teenage girl's legs were severed above the ankle while on a thrill ride at Six Flags Kentucky Kingdom, park officials said.
The accident happened around 4:45 p.m. on the Superman Tower of Power, said Six Flags spokeswoman Wendy Goldberg. It was unclear how the accident occurred or at what point in the ride the 13-year-old was injured.
The ride has been shut down indefinitely while the cause of the accident in investigated. The rest of the park will remain open.
The ride lifts passengers 177 feet straight up, then drops 154 feet, reaching a speed of 54 mph, according to the park's Web site.
Six Flags, the nation's largest regional theme-park operator, expanded the 58-acre Kentucky Kingdom park and re-launched its waterpark for this season, as part of an effort to turn the company around after a 2006 that Chief Executive Mark Shapiro referred to as a "transition year."
The company generated $945 million in revenue in 2006. It does not break down revenue from individual parks in its financial reports.