The Justice Department will investigate the patterns and practices of the Chicago Police Department, U.S. Attorney General Loretta Lynch announced Monday, a move that comes nearly two weeks after the release of a video showing a white Chicago police officer shooting a black teenager 16 times and ahead of the expected release of similar footage in another death at the hands of an officer.

Lynch said the investigation will focus in particular on use of force and deadly force, including racial, ethnic and other disparities in use of force, and its systems of accountability.

It was opened after a preliminary review, said Lynch, who was joined at a news conference by Zachary Fardon, the U.S. Attorney in Chicago, and Vanita Gupta, the head of Justice Department’s Civil Rights Division.

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