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Published on Sep 20, 2013
A late-summer evening, a pickup basketball game, families watching—and suddenly a gunman with a military-grade assault rifle opens fire. A 3-year-old boy is among the 13 shot in Cornell Square Park in the Back of the Yards neighborhood of Chicago Sept. 19, 2013. (E. Jason Wambsgans, Phil Velasquez, Chicago Tribune) For more video, visit http://chicagotribune.com/video, subscribe to this channel, or follow us @TribVideo.