The Justice Department is expected to come down hard on the Baltimore police force in a report set to be released Wednesday evening, multiple federal sources told the Baltimore Sun.

The year-long probe examined the public's allegations that the city's law enforcement officers profiled African-Americans and other minority groups at abnormally high rates, as well as used excessive force when dealing with suspects.

Federal officials revealed Baltimore police regularly violated the constitutional rights of residents by administering unlawful stops. Investigators also discovered officers often retaliated against residents who sought to exercise their right to assembly, the report will say.

The report cited a lack of leadership within the Baltimore Police Department, including little accountability, training and oversight of beat officers, as a factor in how the force has evolved into its current state.

Baltimore officials will review the findings and likely have to offer the Justice Department a plan to improve relations between the public and police, similar to the outcome of the Ferguson, Mo., probe.

Similar to Ferguson, the 2015 death of a young black man, Freddie Gray, while in police custody prompted calls for a federal investigation into the city's police. Three of the six officers charged were acquitted, and charges were dropped against the other three.

Details of the investigation will be announced at a press conference in Baltimore late Wednesday. Justice officials, city leaders and police will be on hand for the news.