A female Philadelphia police sergeant has sued the city, alleging her superiors retaliated against her for reporting a lieutenant’s pattern of sexual harassment against women in the department.

In a complaint filed Thursday afternoon in the U.S. District Court for the Eastern District of Pennsylvania, plaintiff Christina Mellett claimed reporting Lt. Richard Frank’s alleged sexual harassment of other female officers led to increased workplace hostility and a subsequent pattern of discrimination, including reassignment, demotion and disciplinary action.