Wichita ? Twenty-one black police officers filed a class-action lawsuit Wednesday in U.S. District Court, complaining of discriminatory treatment.

The suit, which seeks no monetary damages, said the plaintiffs and other minority officers have been denied desirable job assignments, promotion opportunities, supervisory positions, training, equal pay, bonuses and other employment benefits.

“They’re looking really for change,” said Uzo Ohaebosim, one of the lawyers representing the officers in the suit against the city and Police Chief Norman Williams. The chief, the lawsuit said, has not adequately investigated complaints from minority officers and failed to take steps to eliminate problems with department working conditions.

Joe Lang, first assistant city attorney, said the city had not yet seen the lawsuit, and he and Williams declined comment.

As examples of discrimination, the lawsuit said that racist cartoons had been posted in a squad room, that white officers got longer lunch breaks, that no white officers responded when a black officer made an officer-in-trouble call, and that a black officer was required to provide proof of an appointment that kept her from attending a meeting although her white peers did not have to do so.

The city has failed to “effectively enforce policies prohibiting race and ethnicity discrimination and retaliated against minorities who have protested defendants’ discriminatory policies, pattern and/or practices,” the lawsuit said.