Соответствующая норма
Practice Relating to Rule 1. The Principle of Distinction between Civilians and Combatants
On the basis of Chile’s Code of Military Justice and in the absence of any contrary practice, the Report on the Practice of Chile states that it is Chile’s opinio juris that the prohibition of attacks on the civilian population is an integral part of customary international law. 
Report on the Practice of Chile, 1997, Chapter 1.4, referring to Code of Military Justice, 1925, Article 262.