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In this Thursday, Sept. 19, 2013, photo, a women becomes emotional 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 Violence )

In this still frame made from Thursday, Sept. 19, 2013, video provided by Ken Herzlich, officials and emergency responders tend to a victim at the scene where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. Thursday night's attack was the latest violence in a city that has struggled to stop such shootings by increasing police patrols. (AP Photo/Courtesy Ken Herzlich) ( Chicago Violence )

A Chicago Police detective investigates the scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( Chicago Violence )

The Chicago Fire Department hoses down the scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( Chicago Violence )

Police investigate the scene in Cornell Square Park on the Southside where 11 people including a three-year-old child were shot on September 19, 2013 in Chicago, Illinois. Eighteen people were reported shot in the city, including one fatally, in less than a four-hour period on Thursday evening. (Photo by Scott Olson/Getty Images) ( 181231550 )

A police officer stands guard outside a home where a man was shot in the chest in the Humboldt Park neighborhood on the city's Westside on September 20, 2013 in Chicago, Illinois. (Photo by Scott Olson/Getty Images) ( 181263767 )

Chicago Police detectives investigate the scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( Chicago Violence )

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. (AP Photo/Sun-Times Media, Chandler West) ( Chicago Violence )

Shoes are left behind at the crime scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( APTOPIX Chicago Violence )

A police officer stands guard outside a home where a man was shot in the chest in the Humboldt Park neighborhood on the city's Westside on September 20, 2013 in Chicago, Illinois. (Photo by Scott Olson/Getty Images) ( 181263770 )

A Chicago police officer picks through debris at the crime scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( Chicago Violence )

In this still frame made from Thursday, Sept. 19, 2013, video provided by Ken Herzlich, officials and emergency responders tend to a victim at the scene where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Courtesy Ken Herzlich) ( Chicago Violence )

Chicago Police detectives investigate the scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( APTOPIX Chicago Violence )

This still frame made from Thursday, Sept. 19, 2013, video provided by Ken Herzlich, shows the scene where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Courtesy Ken Herzlich) ( Chicago Violence )

A Chicago Police detective collects crime scene tape from the scene early Friday, Sept. 20, 2013, where a number of people, including a 3-year-old child, were shot Thursday night in a city park in Chicago. (AP Photo/Paul Beaty) ( Chicago Violence )

This Thursday, Sept. 19, 2013, photo shows Cornell Square Park in Chicago's Back of the Yard neighborhood where a Thursday night shooting left multiple victims including a 3-year-old boy. (AP Photo/Sun-Times Media, Chandler West) ( APTOPIX Chicago Violence )