CHICAGO (AP) — A protest march has begun in Chicago’s shopping district, with the Rev. Jesse Jackson in the middle of a crowd that’s shouting, “What do we want? Justice. When do we want it? Now!”

Several hundred demonstrators have gathered in the drizzling rain, many with umbrellas and plastic-wrapped signs.

Among them is 73-year-old Frank Chapman of Chicago, who says a video released Tuesday showing the fatal shooting of 17-year-old Laquan McDonald by police officer Jason Van Dyke confirms what activists have said for years about Chicago police brutality.

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He says his organization, the Chicago Alliance Against Racism and Political Oppression, is pushing for an elected, civilian police accountability council.