Norma relacionada
Practice Relating to Rule 47. Attacks against Persons Hors de Combat
Rwanda’s Law Repressing the Crime of Genocide, Crimes against Humanity and War Crimes (2003) provides:
Article: 8
A war crime is one of the following acts, committed during armed conflicts against persons or property protected under the Geneva Conventions of 12 August 1949 and its Additional Protocols I and II of 8 June 1977:
16° killing or wounding a person in the knowledge that he does not participate in the hostilities, or, in case he did fight, that he has laid down his arms or no longer has the means to defend himself.
Article: 9
Shall be punished by one of the following penalties any person having committed one of the war crimes provided for in Article 8 of this law:
1° the death penalty or life imprisonment where he has committed a crime provided for in point 1°, 2°, 3°, 9°, 11° or 16° of Article 8 of this law. 
Rwanda, Law Repressing the Crime of Genocide, Crimes against Humanity and War Crimes, 2003, Articles 8–9.
In 1993, an international commission of inquiry on human rights violations in Rwanda mandated by four NGOs reported the killing by the Rwandan Armed Forces of 150 combatants of the Front Patriotique Rwandais (FPR) after they had laid down their arms. 
International Commission of Inquiry on Human Rights Violations in Rwanda, Rapport final de la Commission internationale d’enquête sur les violations des droits de l’homme au Rwanda depuis le 1er octobre 1990, in Rapport sur les droits de l’homme au Rwanda, octobre 1992–octobre 1993, Association rwandaise pour la défense des droits de la personne et des libertés publiques, Kigali, December 1993, p. 64.
According to the Report on the Practice of Rwanda, when the Rwandan Government reacted to the report in April 1993, it did not condemn or deplore these acts nor did it express any intention of bringing those responsible to justice. 
Report on the Practice of Rwanda, 1997, Chapter 2.1.