LAS VEGAS -- CityCenter workers are officially going off the job at midnight.

The workers' union said it has not reached an agreement with the general contractor, Perini Building, and that the latest death of a construction worker is unacceptable.

The union said they will not let any other workers on a site that is not safe.

The union is asking for an immediate work site inspection, on-site OSHA training and full site access to union representatives and safety inspectors.

The following statement was released Monday from the public affairs office of MGM MIRAGE:

"General Contractor Perini Building, in cooperation with the construction trade unions, has implemented an aggressive safety training, education and oversight program at the CityCenter worksite. Workplace safety is the joint responsibility of the contractor, sub-contractors and unions; in practice however, safety can only be assured by individuals. We fully support Perini, its sub-contractors and unions all continuing their work together to encourage individual adherence to workplace safety practices."