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Investigators probe Loughner's gun purchase, examine finances

TUCSON - Federal and local investigators are trying to determine how Jared Lee Loughner came up with the money to buy the weapon and ammunition he allegedly used to shoot Rep. Gabrielle Giffords and 18 other people at a Tucson constituent event Saturday, law enforcement sources said Wednesday.

By Sari Horwitz, Dana Hedgpeth and David A. Fahrenthold

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