79 134. In order to comply with the obligation to investigate and punish in the instant case, the State must remove all the obstacles and mechanisms de facto and de jure that maintain impunity, grant sufficient guarantees of security to witnesses, judicial authorities, prosecutors, other judicial agents, and the next of kin of the victims, and use all possible measures to advance the proceeding. 135. Also, in light of this case, the State must adopt concrete measures designed to strengthen its investigatory capacity. In this regard, it should provide the entities responsible for preventing and investigating extrajudicial executions with sufficient human, financial, logistic and scientific resources to process all evidence of a scientific or other type adequately, in order to clarify criminal acts. This should take into account the relevant international norms, such as those established in the United Nations Manual on the Effective Prevention and Investigation of Extra-Legal, Arbitrary and Summary Executions.139 b) Public act acknowledging international responsibility and making reparation 136. In order for Guatemala’s acknowledgement of responsibility and the decisions of this Court to have the full effect of reparation for Mr. Carpio Nicolle and the members of his delegation who were executed, and also to serve as a guarantee of non-repetition, the Court considers that the State should organize a public act acknowledging its responsibility in relation to the attack of July 3, 1993, and the subsequent obstruction of justice in this case, and also honoring the memory of Messrs. Carpio Nicolle, Villacorta Fajardo, Ávila Guzmán and Rivas González, in the presence of the State’s highest authorities. 137. Furthermore, considering the special characteristics of the case, during this act, the State should publicly render homage to the dedication and courage of two individuals involved in the facts of the case: Police Commissioner César Augusto Medina Mateo, who was murdered (supra para. 76(64)), and Abraham Méndez García, one of the prosecutors, who had to go into exile as a result of his investigations (supra para. 76(63)). c) Publication of the pertinent parts of this judgment 138. As it has on other occasions,140 the Court considers that, as a measures of satisfaction, the State must publish, within six months from notification of this judgment, at least once in the official gazette, in another newspaper with national circulation, and in the bulletin with the highest circulation within the Guatemalan armed forces, the section of this judgment entitled Proven Facts (without the corresponding footnotes), paragraphs 77 and 78 of this section entitled Merits, and also the operative paragraphs of this judgment. X COSTS AND EXPENSES Arguments of the Commission 139 Istanbul Protocol, United Nations Publication, Sales No. E.01.XIV.1. 140 Cf. Case of Tibi, supra note 11, para. 260; Case of the “Juvenile Reeducation Institute”, supra note 11, para. 315; and Case of Ricardo Canese, supra note 11, para. 209.