Mayor Rahm Emanuel admitted that, at first, "we didn't really have a comprehensive anti-gang strategy."
The mayor will seek a six-month delay in a court order allowing gun shops in the city.
Rahm and McCarthy touted the study's findings to renew calls for after-school programs and gun control.
Aldermen Edward Burke and James Balcer proposed a ban on guns made with a 3-D printer.
Budget Director Alexandra Holt said overtime adds flexibility and puts more police on the street.
The Budget Committee tabled a measure to spend $25 million on more police officers.
"These officers are right here, right now," said police Supt. Garry McCarthy to justify overtime.
Chicago Police Supt. Garry McCarthy also said murders were down 20 percent this year.
Paula Wolff of Metropolis Strategies says prison population must be reduced to accommodate gun criminals.
Mayor Rahm Emanuel and Police Supt. Garry McCarthy credited Operation Impact with a drop in crime stats.
The City Council's Public Safety Committee chairman noted that the city is already hiring new officers.
The slain teen's mother reacted when Michael Ward and Kenneth Williams were brought to court.
As students from closing schools prepare for a new start, the city is stepping up its security efforts.
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