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Bridgeport police officer Peter Garcia looks for a serial number on a rifle during a gun buyback event in Bridgeport

Bridgeport police officer Peter Garcia looks for a serial number on a rifle during a gun buyback event at the Bridgeport Police Department's Community Services Division in Bridgeport, Connecticut, in the wake of the shootings at Sandy Hook Elementary School, December 22, 2012. REUTERS/ Michelle McLoughlin (UNITED STATES - Tags: SOCIETY)

Gun buyback program collects thousands of weapons