In this photo provided by U.S. Customs and Border Protection, law enforcement 

In this photo provided by U.S. Customs and Border Protection, law enforcement officers gather at a command post in the desert near Naco, Ariz., Tuesday, Oct. 2, 2012, after a Border Patrol agent was shot to death near the U.S.-Mexico line. The agent, Nicholas Ivie, 30, and a colleague were on patrol about 100 miles from Tucson, when shooting broke out shortly before 2 a.m., the Border Patrol said. (AP Photo/U.S. Customs and Border Protection, Gabriel Guerrero)
Associated Press
In this photo provided by U.S. Customs and Border Protection, law enforcement officers gather at a command post in the desert near Naco, Ariz., Tuesday, Oct. 2, 2012, after a Border Patrol agent was shot to death near the U.S.-Mexico line. The agent, Nicholas Ivie, 30, and a colleague were on patrol about 100 miles from Tucson, when shooting broke out shortly before 2 a.m., the Border Patrol said. (AP Photo/U.S. Customs and Border Protection, Gabriel Guerrero)
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