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In this Thursday, Sept. 19, 2013, photo, officials convene near the scene of a shooting at Cornell Square Park in Chicago's Back of the Yard neighborhood that left multiple victims including a 3-year-old boy. Thursday night's attack was the latest violence in a city that has struggled to stop such shootings by increasing police patrols. (AP Photo/Sun-Times Media, Chandler West)

Chicago park shooting

Thirteen people have been shot at a park on Chicago's southwest side, including a 3-year-old boy who was in critical condition. (AP)