Protesters have pledged continued
In a separate letter sent to Jackson earlier this week, the Justice Department said its investigators had observed Ferguson police officers not wearing, or obscuring, their name tags on their uniforms, a violation of the police department's rules.
"The failure to wear name plates conveys a message to community members that, through anonymity, officers may seek to act with impunity," the letter said.
Jackson, following weeks of heavy criticism and calls for his ouster, issued a video apology to Brown's parents on Thursday. He later began marching with a group of protesters, but a scuffle broke out near him and several people were arrested.
In addition to the Justice Department probe, a grand jury in St. Louis County is examining the case.
Protesters have pledged continued civil unrest until Wilson is charged in Brown's death and on Friday night several dozen people gathered in downtown Ferguson to call for Jackson's ouster.
Police kept a low-key presence during the demonstrations, showing none of the aggressive tactics that had led to prior clashes with protesters.
