Hours after a U.S. Border Patrol agent was shot and killed, and one other was shot and injured, Manuel Padilla, left, U.S. Border Patrol Acting Chief Patrol Agent Tucson Sector, and Jeffrey Self, U.S. Border Protection Joint Field Command Arizona, leave after a news conference at the U.S. Customs and Border Protection Brian A. Terry Border Patrol Station Tuesday, Oct. 2, 2012, in Bisbee, Ariz.(AP Photo/Ross D. Franklin) less