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Det. Bill Silva, left, with the Bisbee Police Department, and an unnamed agent with the Drug Enforcement Administration patrol a fence line east of Naco, Ariz., after a Border Patrol agent was killed early Tuesday, Oct. 2, 2012. The shooting occurred after an alarm was triggered on one of the thousands of sensors placed by the U.S. government along the border, and the agents went to investigate, said Cochise County Sheriff’s spokeswoman Carol Capas.

Mike Christy / Arizona Daily Star