Later in the afternoon, at least one man detained after several instances of shoving between police and activists.



"If they got a problem with us, we have a problem with them. How can you expect us to be peaceful when your officers are not peaceful," said Dontreal Widow, 20, of Hyde Park.



"Don't get me wrong, there are some officers who are letting us do whatever we want. But there are others who are are putting their hands on us and who have an attitude."



Gregory Livingston, a member of the Coalition for a New Chicago, praised young protesters initially, but found himself condemning others who were jawing with cops.



Earlier, some shoppers tried to push past protesters at Water Tower Place. Sixteen-year-old activist Lamon Reccord led protesters in rebuffing a would-be shopper and a store employee who tried to help the man inside the Columbia Sportswear store on Michigan Avenue.



"They were kind of mad, but it's not our fault, it's Rahm's fault," Widow said. "Some of them understand where we're coming from, but we want all of them to understand where we're coming from."



The protest is the latest in a series of demonstrations in the city since the release last month of police dash-cam video showing a white officer shooting 17-year-old McDonald 16 times. Officer Jason Van Dyke has been charged with first-degree murder in the October 2014 killing.