A 59-year-old man was shot dead in Englewood early Wednesday.
The 16-year-old is a documented gang member, police said.
A 59-year-old man was killed and a 34-year-old man was injured in the shooting early Wednesday.
The fatal shooting of the teen touched off protests in Chicago.
Among the arrested is Malcolm London, a protest leader who allegedly hit an officer, police say.
#FreeMalcomLondon was trending nationally on Twitter Wednesday.
"We've got to get [people] to a point where they're officer-friendly — or this stuff's gonna eat us up."
No arrests have been made after the Friday night incident in the 700 block of South Halsted St.
A letter sent to all CPS parents warned that the footage will "raise many amotions among our children."
"Anyone who is there to uphold the law cannot act like they are above the law," Mayor Rahm Emanuel says.
State's Attorney said concerns over public safety led her to charge Jason Van Dyke sooner than planned.
The district's "deeply sorry" for the incident that sickened about 80 people last month.
More than a dozen activists stood at the corner of 41st and Pulaski, where McDonald was killed in 2014.
Officer will be held without bond until judge sees video and decides whether to reconsider bail amount.
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