Twenty-five people were trapped 20 feet above the ground and at a "precarious" angle on a roller coaster at Six Flags Magic Mountain Monday. Park officials say that the coaster car on the "Ninja" ride became stuck after a tree branch fell on the track. According to KTLA, four people sustained minor injuries.

The Los Angeles Times reports that a team with specialized tools were called to the scene to cut through the brush and break the car free. Further from KTLA:

Multiple cars holding riders appeared to be stuck at an angle in an area where the tracks pass under trees, aerial video from the scene showed.

Firefighters appeared to cutting at or struggling with foliage near the large white pillars that support the ride.

The Ninja, as described by Six Flags ("Ninja is temporarily closed"):

There's a reason Ninja is known as "The Black Belt of Roller Coasters." This thrill is a suspended swinging roller coaster. There are only four of this kind in the entire U.S. and you're about to ride one of them. You're hanging from the track, which on this insane ride is above your head. Shoulder harnesses secure you in place but don't expect to just sit in one place — you're going to be swinging all over, a full 90 degrees each way.

According to the Associated Press, riders were stuck for nearly an hour before being rescued.

[Image via KTLA]