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(NEWSER) – The Justice Department is planning an investigation of the police department in Ferguson, Mo., that will go far beyond the shooting of unarmed teenager Michael Brown last month.

The probe, which will look at the force's behavior over the last several years to determine whether racial profiling and excessive force created a pattern of civil rights violations, will be announced by Attorney General Eric Holder today, federal law enforcement officials tell the Washington Post.

The officials say the probe will also look at other St. Louis County police forces. The Justice Department's civil rights division and the FBI are already investigating the Brown shooting.

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