Соответствующая норма
Practice Relating to Rule 7. The Principle of Distinction between Civilian Objects and Military Objectives
Section D. Attacks against places of civilian concentration, including schools
In 1993, the German Chancellor strongly criticized the “brutal siege and the shelling of the Muslim town of Srebrenica”. 
Germany, Statement by the Chancellor, Helmut Kohl, 19 April 1993, Bulletin, No. 31, Presse- und Informationsamt der Bundesregierung, Bonn, 21 April 1993, p. 270.