Chicago's police chief was ousted on Tuesday following days of unrest over video footage showing the shooting of a black teenager and the filing of murder charges against a white police officer in the young man's death.

Mayor Rahm Emanuel announced during a news conference he had asked Police Superintendent Garry McCarthy to resign. The mayor also said he was creating a new police accountability task force.

The white officer, Jason Van Dyke, was charged a week ago with first-degree murder in the killing of Laquan McDonald, who was shot 16 times. The video of the killing was released on the same day.