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The Border Patrol has warned agents in Arizona that many of the intruders were “trained to escape, evade and counter-ambush” if detected. The agency cautioned agents to keep “a low profile,” to use “cover and concealment” in approaching the Mexican units, to employ “shadows and camouflage” to conceal themselves and to “stay as quiet as possible.”

Several of the incursions occurred in the same area where Terry was killed, including a 2005 incident in which two agents were wounded by assailants dressed in black commando-type clothing in what law-enforcement authorities said was a planned ambush. More than 50 rounds were fired at the agents after they spotted the suspected gunmen.

Many of the Mexican drug cartels use former Mexican soldiers, police and federal agents to protect drug loads headed into the U.S. Many cartel leaders also have targeted U.S. Border Patrol agents and state and local police, sometimes offering bounties of up to $50,000.