Border Patrol agent killing

Associated Press
This undated photo provided by U.S. Customs and Border Protection shows Border Patrol agent Nicolas Ivie. Ivie was shot to death Tuesday, Oct. 2, 2012 in Arizona near the U.S.-Mexico line, the first fatal shooting of an agent since a deadly 2010 firefight with Mexican bandits that spawned congressional probes of a botched government gun-smuggling investigation. (AP Photo/U.S. Customs and Border Protection)

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The head of the U.S. Border Patrol agents' union says the agent killed last week in a shooting in southern Arizona apparently opened fire on two colleagues thinking they were armed smugglers and was killed when they returned fire. (Oct. 8)

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