Article Photos: Authorities face tough territory in border probe 1/13

  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)