Roller Coaster Derails at California's Six Flags Magic Mountain

A tree branch that fell across the tracks left passengers dangling 20 feet in the air.
2:05 | 07/08/14

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Transcript for Roller Coaster Derails at California's Six Flags Magic Mountain
We start with that roller coaster accident at a California six flags. ABC's Cecilia Vega is outside the park in Valencia with all the latest. Good morning, Cecilia. Reporter: Good morning. We are talking about a suspended swinging ride high in the air with speeds of 4. Gs around the turn. For those stuck on it, what a terrifying ride it was. Incoming units to magic mountain. We still have victims on the ride. Reporter: Take a look. The riders were trapped for nearly three hours. 22 people dangling precariously. Yeah, the coaster hanging railcars, about seven railcars ranging from 20 to 30 feet off the ground. We'll have to remove all the patients. This is going to be challenging. Reporter: Four sent to the hospital after riding a roller coaster known as the ninja at six flags magic mountain amusement park outside los Angeles. Rescue workers say a tree branch fell on the tracks late Monday evening redaling the first car and forcing it to shut down. See that white metal arm? It's supposed to be attached to that red railing. It was really scary. I was sketched out to get on any other rides. Reporter: The ride called the black belt of roller coasters looks like this. Its online description says as you shoot down the snake-like steel track you'll grip the hillsides and blast through the trees swiftly slicing through the landscape. Ninja pivots with precision as you narrowly miss tagging land and water whipping around at 55 miles per hour. There was a lot of panic and confusion. Sounded like they were panicki panicking. Reporter: As day turned to night, firefighters struggled to work their way through the thick branches to lower the 22 riders to safety. Lifting them off one by one from seven cars. Late Monday, six flags said in a statement "The safety of our guests and employees is our number one priority." Now, thankfully those injuries were all minor. The park says that the ninja will remain off-limits until a thorough inspection is completed. All right, Cecilia, thank you

This transcript has been automatically generated and may not be 100% accurate.

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