The families of three firefighters killed in a 2016 blaze and several of their injured colleagues filed a civil rights and wrongful death lawsuit against the city of Wilmington on Thursday accusing four former officials of constitutional violations in enacting a controversial policy that allegedly prevented needed water from arriving.

The 75-page complaint, filed in Delaware federal court, blamed former Mayors Dennis P. Williams and James M. Baker, as well as former fire Chiefs Anthony S. Goode and William Patrick Jr., of implementing a citywide policy known as “rolling bypass.”