Norma relacionada
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 1972, in a statement before the UNESCO General Conference, China criticized the United States for having “wantonly bombarded Vietnamese cities and villages”. 
China, Statement before the General Conference of UNESCO, 25 October 1972, Selected Documents of the Chinese Delegation to the United Nations, The People’s Press, Beijing, 1972, p. 239.