PHOTOS: Six Flags Magic Mountain riders stuck on Ninja roller coaster

VALENCIA, Calif. (KABC) -- Nearly two dozen riders were stuck after a tree branch fell onto the Ninja roller coaster at Six Flags Magic Mountain on Monday.

The coaster hit a branch shortly before 6 p.m., derailing one of the cars. The four people up front had minor injuries, according to an L.A. County Fire inspector.

The park said two people were transported to a local hospital for precautionary measures.

Ninja will remain closed until a full inspection is complete, the park said.

See photos of the accident.