About two dozen protesters yesterday gathered outside Mayor Rahm Emanuel's City Hall office on the day after authorities released a graphic squad-car video showing the officer shooting 17-year-old Laquan McDonald 16 times.

The officer, Jason Van Dyke, was charged with first-degree murder.

The group held banners showing photos of other black people fatally shot by police in Chicago and elsewhere. Several protesters said they were parents of black men who were killed by Chicago officers.

A number of police killings of black men over the past year have given rise to the nationwide 'Black Lives Matter' movement, pushing the issue to prominence in the midst of the 2016 presidential campaign.

One of Clinton's rivals, Sen Bernie Sanders, said in his own statement that all Americans 'should be sickened' by the video.

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