FERGUSON, Mo. (AP) — Ferguson, Missouri’s police chief has marched with protesters, hours after issuing an apology to the family of Michael Brown, the unarmed black 18-year-old who was shot dead by a white police officer in August.

Police Chief Tom Jackson appeared outside the police department in civilian clothes Thursday night and assured protesters that there would be changes in the wake of Brown’s death.

He started to march with protesters when a scuffle broke out behind him. One protester was arrested. The St. Louis Post-Dispatch reports that at least three more protesters also were arrested Thursday night.

Earlier in the day Jackson, in a video released by a public relations firm, apologized to Michael Brown’s family, saying his body had been left in the street far too long.

A state grand jury is investigating the shooting, and Brown’s family is pressing for a full federal investigation. The U.S. Department of Justice is looking into possible civil rights violations.

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