Three rides at Disneyland in California, including the famous Space Mountain roller coaster, have been closed after citations from state regulators.
Disneyland Resorts spokeswoman Suzi Brown said the closures were voluntary and made out of an abundance of caution after citations were received from the California Division of Occupational Safety and Health (OSHA).
Space Mountain, the Matterhorn Bobsleds and Soarin' Over California were all closed to the public at the weekend.
Ms Brown said: "We constantly strive to maintain a safe work environment for our cast members and contractors - and we are reviewing certain protocols."
The citations were related to an incident in November when a worker was injured while carrying out maintenance on the exterior of the Space Mountain attraction.
According to a description of the citation on the Cal/OSHA website, Disneyland had failed to adequately correct "known fall hazards" on the attraction,
The Matterhorn reopened on Sunday but Ms Brown said it was unclear how long the other two rides would remain closed.