Four construction workers suffered non-life-threatening injuries after a steel rebar wall toppled over at the CityCenter construction site on the Las Vegas Strip.
MGM Mirage Inc. spokeswoman Yvette Monet says the 25-foot-tall, 150-foot-long wall, located near the main hotel tower, fell at about 1 p.m.
Monet says the workers would have been on the north side of the wall and in the worst case, would have ridden on top of it on its way down.
The workers were taken to a hospital.
One was described as being able to walk.
The site has some 5,000 workers on the job.
MGM Mirage plans to open the $7.8 billion CityCenter casino resort in late 2009.