6. On March 14 and 17, 2012, the Inter-American Commission and the representatives, respectively, presented their observations on the State’s objection to the Court’s temporal jurisdiction and on its partial acknowledgement of responsibility (supra para 5). 7. Following the presentation of the main briefs (supra paras. 1 to 5), in an Order of May 31, 2012, the President of the Court required that the statements of four presumed victims, the testimony of one witness, and the opinions of three expert witnesses proposed by the Inter-American Commission, the State and the representatives, respectively, be received by affidavit. The parties and the Commission had the opportunity to formulate observations and questions for the presumed victims and expert witnesses. In addition, the President convened the Inter-American Commission, the representatives, and the State to a public hearing to receive the statements of two presumed victims and the opinions of two expert witnesses offered by the representatives and the Inter-American Commission, respectively, as well as the final oral arguments of the representatives and the State, and the final oral observations of the Commission on the preliminary objection, merits, reparations and costs.3 8. On June 12, 2012, the President of the Court asked the Inter-American Commission to forward the list of presumed victims, organized by family units. 9. The public hearing was held on June 19 and 20, 2012, during the Court’s ninety-fifth regular session. During the hearing, the Court asked the parties and the Inter-American Commission to provide certain clarifications, additional information, and helpful evidence when presenting their final written arguments and observations.4 10. After two extensions, on July 3, 2012, the Commission presented the list of presumed victims, organized by family units. 11. On July 5 and 6, 2012, respectively, the “Strategic and Structural Litigation Unit” of the Human Rights Clinic of the Pontificia Universidad Javeriana, Cali, and the Human Rights Program of the Universidad Veracruzana submitted amicus curiae briefs in this case. 12. On July 20, 2012, the representatives, the State, and the Inter-American Commission submitted their respective final written arguments and observations electronically. Together with their briefs, the Commission, the representatives and the State forwarded most of the clarifications and documents requested during the public hearing (supra para. 9). On July 23, 2012, the State submitted more of the documents requested by the Court. On July 27, 2012, the representatives forwarded the original of their final written 3 Cf. Case of the Río Negro Massacres v. Guatemala. Summons to a Public Hearing. Order of the President of the Inter-American Court of Human Rights of May 31, 2012. This Order is available at: http://www.corteidh.or.cr/docs/asuntos/rio_01_06_12.pdf. Following this summons, on June 18, 2012, the State desisted from its offer of the testimony of Manuel Giovanni Vásquez. 4 At this public hearing there appeared: for the Inter-American Commission on Human Rights: Rosa María Ortíz, Commissioner, and Karla I. Quintana Osuna, specialist of the Executive Secretariat; for the representatives: Edgar Fernando Pérez Archila, Juan de Dios García Xajil, Tomás Marcelino Alonzo Teletor, Jorge Alfredo Xitumul Sucup, María Hortencia Lajuj Sánchez, María Eustaquia Uscap Ivoy, María Osorio Chen, Bruna Pérez Osorio, Jose Osorio Sic, José Osorio Osorio, Cruz Pérez Osorio, Juana Chen Osorio, Juan Chen Osorio, Carmen Sánchez Chen, Tomasa Osorio Chen, Edgar Alfredo Ortega Franco, José Rodolfo González Sierra, Ana Elisa Virginia de la Asunción Samayoa Guzmán, Silvia Weber, María Purvis, Denis Becker and Scott Sic; for the Republic of Guatemala: Antonio Arenales Forno, Minister for Peace; Larry Mark Robles Guibert, Attorney General; Raúl Morales Moscoso, Vice Minister for Foreign Affairs; Jorge Humberto Herrera Castillo, President of the National Reparations Program; María Elena de Jesús Rodríguez López, Agent for the State, and Diego Roberto Estrada Tobar, Legal Adviser of the Department for Monitoring International Human Rights Cases of the Presidential Committee for Coordination of the Executive’s Human Rights Policies. 7