Moving Glenn Evans was necessary to put out "fires" on the West Side, the police chief said.
Mayor Rahm Emanuel stressed "quality of life" issues instead at a Police Department media event.
The mayor will seek a six-month delay in a court order allowing gun shops in the city.
MARK KONKOL: More detectives and cops on the beat are helping crack the "no-snitch" code, police say.
Last month, there were 16 murders in Chicago, 36 fewer than in March of 2012, police said.
Chicago police solved 25 percent of murders in 2012 — the lowest clearance rate in 21 years.
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