Six Flags and another amusement park company shut down eight more thrill rides after a teenage girl had her feet chopped off at the ankle on a Superman Tower of Power.
State inspectors, meanwhile, returned to Six Flags Kentucky Kingdom where the accident happened to examine the ride, which lifts passengers 177 feet (54 meters) straight up, then drops them nearly the same distance at speeds reaching 54 mph (87 kph).
It was unclear at what point during the ride the 13-year-old was injured Thursday, said Wendy Goldberg, a Six Flags spokeswoman. The girl was taken to a hospital. She was not identified and details of her condition were not immediately available Friday.
Six Flags has shut down similar rides at parks in St. Louis, Gurnee, Illinois, and near Washington as a safety precaution, Goldberg said. Six Flags Over Texas, near Dallas, also has a Superman Tower of Power, but it is not the same ride, Goldberg said.
There were no reports of injuries on the ride before Thursday, she said.
"Millions of people have safely ridden this ride in our parks," Goldberg said.
The accident led Cedar Fair Entertainment Co. to shut down and inspect drop tower rides at five of its amusement parks as a precaution, company spokeswoman Stacy Frole said.
Intamin, a Swiss company, made all the rides that were closed by both companies, said Craig Ross, a spokesman for Cedar Fair.
"We're going to keep these things down until we're certain it's safe," Ross said. "We'll wait and see."
An e-mail message sent to Intamin was not immediately returned Friday.
The five Cedar Fair rides that will be shut down are at Kings Island near Cincinnati; Canada's Wonderland, in Toronto; Kings Dominion in Doswell, Virginia; Carowinds, in Charlotte, North Carolina; and Great America in Santa Clara, California.