Related Rule
Practice Relating to Rule 85. The Use of Incendiary Weapons against Combatants
Section A. The use of incendiary weapons in general
Uruguay’s Law on Cooperation with the ICC (2006) states:
26.2. Persons and objects affected by the war crimes set out in the present provision are persons and objects which international law protects in international or internal armed conflict.
26.3. The following are war crimes:
45. Using incendiary booby-traps or weapons, understood as any weapon, ammunition or booby-trap primarily designed to set fire to objects or to cause burn injury to persons through the action of flame, heat or the combination of both produced by chemical reaction. 
Uruguay, Law on Cooperation with the ICC, 2006, Article 26.2 and 26.3.45.