§ 2. Crimes
Section 6
1. Anyone who, in the case of an armed conflict not of an international character, commits a violation of article 3 common to all of the Geneva Conventions, namely the commission against persons taking no active part in the hostilities, including members of armed forces who have laid down their arms and those who are placed hors de combat by sickness, wounds, detention, or any other cause, of one of the following acts:
(d) the passing of sentences and the carrying out of executions without previous judgement pronounced by a regularly constituted court, affording all the judicial guarantees which are generally recognised as indispensable;
shall be liable to life imprisonment or a term of imprisonment not exceeding thirty years or a sixth category fine.

Article 8
War crimes
2. For the purpose of this Statute, "war crimes" means:
(c) In the case of an armed conflict not of an international character, serious violations of article 3 common to the four Geneva Conventions of 12 August 1949, namely, any of the following acts committed against persons taking no active part in the hostilities, including members of armed forces who have laid down their arms and those placed hors de combat by sickness, wounds, detention or any other cause:
(iv) The passing of sentences and the carrying out of executions without previous judgement pronounced by a regularly constituted court, affording all judicial guarantees which are generally recognized as indispensable.

This provision follows the ICC Statute.