Thirteen city of Dallas employees have filed a lawsuit alleging ethnic discrimination and retaliation.
The plaintiffs filed their suit Wednesday. They include black, Hispanic and Asian workers of Dallas Water Utilities.
A statement by the city of Dallas says officials have not yet reviewed the allegations. But deny the unlawful conduct.
The employees say they were threatened, verbally harassed and intimidated by racist graffiti written on bathroom walls.
The city says some of the allegations date back seven years and corrective measures were taken then. The statement also says the Department of Justice declined to file a lawsuit in the case.