In a June 9, 2012 photo, the Chicago Police gang enforcement unit stops a car with four suspected gang members and arrests one of them on a warrant. In Chicago, homicides are up over 50 percent over last year. (AP Photo/Robert Ray)

Associated Press
In a June 9, 2012 photo, the Chicago Police gang enforcement unit stops a car with four suspected gang members and arrests one of them on a warrant. In Chicago, homicides are up over 50 percent over last year.  (AP Photo/Robert Ray)
In a June 9, 2012 photo, the Chicago Police gang enforcement unit stops a car with four suspected gang members and arrests one of them on a warrant. In Chicago, homicides are up over 50 percent over last year. (AP Photo/Robert Ray)
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