A roller coaster hit a tree branch at the Six Flags Magic Mountain amusement park Monday, dislodging the front car, leaving four people slightly injured and keeping nearly two dozen summer fun-seekers hanging 9 metres in the air for hours as day turned to night.
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Two of the four people hurt on the Ninja coaster were taken to the hospital as a precaution, but all the injuries were minor, fire and park officials said.
The coaster hit the branch about 5:30 p.m. PT and stopped, said Michael Pittman, a Los Angeles County Fire Department dispatch supervisor. It was nearly three hours later before all 22 of the riders were rescued.
Televised news reports showed at least one of the cars that normally are suspended beneath the track dangling at an angle, derailed at the front.
Firefighters and park maintenance workers in harnesses could be seen removing the riders one by one from coaster cars. The riders could be seen waiting patiently as firefighters tried to reach them through a tangle of track and trees, some talking with each other and others resting with their eyes occasionally closed.
All were alert and communicated with park staff during the evacuation process, Six Flags said in a statement.
The park's website advertises that Ninja swoops through the trees to give riders a thrill.
"As you shoot down the snake-like steel track you'll grip the hillsides and blast through the trees swiftly, slicing through the landscape," the ride's online description says. "Ninja pivots with precision as you narrowly miss tagging land and water, whipping around at 55 miles per hour."
2nd Six Flags incident in 1 year
The ride would remain shut down while the accident was investigated, park spokeswoman Sue Carpenter said in a statement.
Six Flags Magic Mountain is in the Valencia area of Santa Clarita, about 80 kilometres north of Los Angeles.
The accident comes nearly a year after a woman was ejected from a roller coaster at Six Flags Over Texas in Arlington and died. The death was ruled an accident, but her family has sued both Six Flags and the German company that built the coaster's trains, both of whom denied any wrongdoing.
In September 2012 at another Southern California amusement park, Knott's Berry Farm, riders were left dangling at 91 metres for more than three hours when its Windseeker ride broke down. No one was injured in that breakdown.