[KHTS] – About two dozen riders riders were trapped on the Ninja roller coaster at Six Flags Magic Mountain Monday afternoon.

“There are some people who are stuck on the ride,” said Supervisor Michael Pittman of the Los Angeles County Fire Department. “There are 20-30 people stuck on a roller coaster about 20-30 feet in the air.”

The riders are reportedly stuck on Ninja, according to an official.

The Los Angeles County Fire Department’s Urban Search and Rescue Team has been dispatched to the amusement park, Pittman said.

Initial reports indicated a tree was blocking the path of the ride; however, Pittman was unable to confirm the details.

The team is expected to use ladders to rescue the riders, Pittman said, adding, “A lot of it is going to depend on how much ground we have underneath them.”

There was no reports of injuries at this time, however, the Fire Department is still working to determine the best way to get the riders down.

An attempt to reach a Six Flags Magic Mountain official was unsuccessful.

The roller coaster was built in 1988, according to a review from The Coaster Guy.

“Dubbed ‘the Black Belt of Roller Coasters,’ Ninja is a suspended swinging roller coaster built by Arrow Dynamics at a cost of $6 million,” according to The Coaster Guy’s website.

Update: 7:10 p.m.

About 20 people are still stuck on the ride, said Pittman. A search and rescue team arrived at 6:15 p.m. The ride was stopped from a branch falling onto the track.

“There are reported four minor injuries,” said Pittman. “The biggest problem right now is trying to get them down. The units on scene are trying to make the best assesment.”

Fire Station 126 was the first crew on scene.

There are 20 people on the ride who have not been evacuated yet.

Update: 7:16 p.m.

People are currently being evacuated, reports NBC Los Angeles.

Eight more people are on the ride and may need to be brought down by some sort of harness, reports NBC.

Attempt to reach a Six Flags MAagic Mountain official is unsuccessful.

Update: 8:01 p.m.

Los Angeles County Fire crews are evacuating people off of the damaged cars. Fire crews are using a fork-lift type vehicle to bring the stranded riders down from the damaged cars on Ninja.

Update: 8:13 p.m.

The last person from Ninja’s car two has been evacuated leaving four people in the front car to be evacuated, according to the NBC News live feed.

Update: 8:30 p.m.

NBC reports final two stranded riders are about to be evacuated.

Update: 8:36 p.m.

The last stranded rider has been taken off of the ride safely, Ninja at Six Flags Magic Mountain reports NBC News live feed.

“Tonight a branch fell on the Ninja coaster track obstructing the train,” according to the Six Flags Magic Mountain Twitter account. “Riders are all down and safe. Ride closed until cleared.”