Antoine Rogers, 16, was charged with unauthorized use of a weapon on school grounds.
A 17-year-old girl used a McDonald's smoothie as a weapon against a police officer, authorities said.
$32M UCAN "safe house" will be dedicated to violence prevention and youth rehabilitation.
The first lady will discuss opportunties for youths at a luncheon hosted by Mayor Rahm Emanuel.
Accused carjacker, 16, evoked the actor while fumbling with the clip on his gun, prosecutors said.
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