The US Justice Department has found evidence of racial bias at Ferguson police in Missouri, US media reports.
The investigation will reportedly accuse the department of conducting stops without reasonable suspicion and making arrest without probable cause.
The Justice Department began the civil rights investigation following the August shooting of Michael Brown.
A white police officer killed the unarmed black 18-year-old, sparking protests in Ferguson and nationwide.
A separate report is expected to clear the officer, Darren Wilson, of any civil rights violations in the shooting of Mr Brown.
Officials announced the findings by speaking anonymously to various US media.