Ferguson Police Chief Tom Jackson appeared outside the police department in civilian clothes late yesterday to assure protesters that there would be changes in the wake of Brown's killing, The St Louis Post-Dispatch reported.
Brown was unarmed when he was fatally shot August 9 during a confrontation with Officer Darren Wilson. The shooting sparked numerous protests and racial unrest in the predominantly black community.
"All those things that are causing mistrust are being evaluated and we are going to be making changes," Jackson said.
The police chief started to march with protesters around 11 pm (local time) soon after, a scuffle broke out behind the chief and one protester was arrested. The Post-Dispatch said at least three other protesters were arrested after another confrontation.
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The Ferguson Police Department spokesman didn't immediately return call to The Associated Press early today.
Brown's body remained on Canfield Drive, a residential street, for more than four hours while police collected evidence.
"It was just too long and I'm truly sorry for that," Jackson, dressed casually in a red polo shirt instead of his police uniform, said on the video.
"Please know that the investigating officers meant no disrespect to the Brown family, to the African-American community or the people of Canfield (Drive). They were simply trying to do their jobs."
Brown's parents declined comment when told about Jackson's video during a news conference with civil rights leaders at the National Press Club. Their attorney later said they hadn't heard about the video but would review it.
"It is clear that we have much work to do," Jackson said in the video.
The US Department of Justice is investigating the Ferguson Police Department for possible civil rights violations.