Associated Press
FILE - In this Feb. 13, 2013 file photo, Chicago Mayor Rahm Emanuel, right, and Chicago Police Superintendent Garry McCarthy discuss gun violence at a news conference in Chicago.  Hundreds of Chicago police officers are hitting the streets on overtime every night in dangerous neighborhoods, the latest tactic by Emanuel's administration to reduce killings in a city dogged by its homicide rate and heartbreaking stories about honor students and small children caught in the crossfire. The decision by McCarthy last month to put small armies of officers working overtime in specific "hot zones" corresponds with a notable drop in homicides in the nation's third-largest city in February and March  (AP Photo/M. Spencer Green, FIle)

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