The U.S. Justice Department plans to launch an investigation of the Ferguson police department, whose officer shot an killed unarmed black teen Michael Brown last month in the St. Louis suburb, CNN reports

The federal probe will look into the the practices of the department and the training of its officers, who came under criticism for using a very heavy hand and military-style tactics during the days of protests that followed Brown's shooting.

A separate, civil rights investigation by the Justice Department into Brown's shooting is already happening.

Brown's shooter, officer Darren Wilson, could face criminal charges, depending on the outcome of an ongoing grand jury investigation that could take until October to wrap up. 

CNN reports that Justice Department officials were in Missouri today to let Ferguson officials know their plans to launch the probe into the city's police department. 

[Via CNN]