Соответствующая норма
Practice Relating to Rule 12. Definition of Indiscriminate Attacks
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states: “Indiscriminate attacks, i.e. attacks which cannot distinguish between protected persons/objects and military objectives, … are prohibited in any place and at any time.” 
Switzerland, Bases légales du comportement à l’engagement (BCE), Règlement 51.007/IVf, Swiss Army, issued based on Article 10 of the Ordinance for the Organization of the Federal Department for Defence, Civil Protection and Sports of 7 March 2003, entry into force on 1 July 2005, § 225.
(emphasis in original)
Switzerland’s ABC of International Humanitarian Law (2009) states: “The principle of distinction imposes limits on means and methods of warfare: any Weapon or strategy that cannot be directed exclusively at a specific military objective is prohibited.” 
Switzerland, Federal Department of Foreign Affairs, ABC of International Humanitarian Law, 2009, p. 17.