Related Rule
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 1971, during a debate in the Third Committee of the UN General Assembly concerning respect for human rights in armed conflicts, Liberia stated that it “agreed wholeheartedly with the principle that … dwellings … should not be the object of military operations as affirmed in [principle 5] of General Assembly resolution 2675 (XXV)”. 
Liberia, Statement before the Third Committee of the UN General Assembly, UN Doc. A/C.3/SR.1890, 1 December 1971, § 8.