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If the Supreme Court strikes down the ability of municipalities like the District of Columbia to regulate guns, Chicago and other cities with handgun bans would see a return of gun stores and an upswing in crime, Mayor Richard Daley said Tuesday.

“That would open a Pandora’s box,” he said following a news conference with Los Angeles Mayor Antonio Villaraigosa to promote federal legislation requiring microstamped identifiers on cartridges fired from semiautomatic handguns.