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October 5, 2012
David Wallace photo

Border Patrol Agents and Secretary of Homeland Security Janet Napolitano’s security detail stand guard outside the Brian A. Terry Border Patrol Station outside in Bisbee, Ariz. on Friday, Oct. 5, 2012. A preliminary investigation has found friendly fire likely was to blame in the shootings of two border agents along the Arizona-Mexico border, the FBI said Friday.

David Wallace photo

A helicopter believed to be carrying Homeland Security Secretary Janet Napolitano takes off from the Brian A. Terry Border Patrol Station outside in Bisbee, Ariz. on Friday, Oct. 5, 2012. A preliminary investigation has found friendly fire likely was to blame in the shootings of two border agents along the Arizona-Mexico border, the FBI said Friday.