Règle correspondante
Practice Relating to Rule 157. Jurisdiction over War Crimes
Cameroon’s Instructor’s Manual (2006) states:
Universal Jurisdiction
The states that have ratified the Geneva Conventions and their Additional Protocols are obliged to search for and prosecute any person who has committed or ordered to commit grave breaches of the law of armed conflict and international humanitarian law, irrespective of their nationality. They are obliged to prosecute or extradite [such persons]. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 296, § 662; see also p. 295 and p. 297, § 663.