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Mexico
Practice Relating to Rule 47. Attacks against Persons Hors de Combat
Section A. General
Mexico’s Army and Air Force Manual (2009), in a section entitled “Basic rules of international humanitarian law applicable in armed conflicts”, states: “It is forbidden to kill or injure an enemy who surrenders or who is hors de combat.” 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 407.