Las Vegas— Safety and construction officials are investigating what caused a crane to buckle and malfunction at MGM Mirage's CityCenter resort work site.
The unstable 180-foot crane shut down traffic on the Las Vegas Strip for more than an hour. No one was injured.
It was the latest in a series of accidents at the site of the massive casino resort project. Six workers have been killed on the site since construction began 16 months ago.
Federal and state safety inspectors have been conducting a comprehensive safety review, and they were on site when the crane malfunctioned.
A spokeswoman for MGM Mirage Inc. said general contractor, Perini Building Co., is reviewing the incident.