13 [o]n January 24, 1998, Mr. Oscar Humberto Vásquez, son of Mr. Oscar Vásquez (a victim in the "white van" case) and a witness who had testified before the Honorable Court in September 1997, was unlawfully detained by a group of three unknown men, who attacked him violently and threatened his life. The Commission also said that Mr. Vásquez had been threatened, that the Office of the Department of the District Attorney ["Ministerio Público"] had refused to accept a complaint about the events, and that the precautionary measures adopted to protect the members of the Vásquez family (supra, para. 17) had not yielded satisfactory results. 57. On February 10, 1998, the President required the State to adopt such measures as were necessary to ensure the physical integrity of the members of the Vásquez family and to investigate the attack on Mr. Oscar Humberto Vásquez. 58. On February 16, 1998, the State submitted its first report on the measures adopted in compliance with the Order of the President. On February 19, the Secretariat, at the President’s instruction, requested the State to submit forthwith to the Court documents containing the results of the action taken to protect the Vásquez family, especially those contained in points one and four of its report. On the following day, the State submitted another document also titled as the first report on the measures adopted in this case. VI DOCUMENTARY EVIDENCE 59. The significant documentary evidence in this case includes, first of all, the extensive report prepared by the National Police of Guatemala, C.A. dated June 6, 1988, and dispatched to the Judge of the Magistrates' Court of Santa Catarina Pinula, Zone 14, through official communication No. 3214. Subsequently, at the public hearing before the Court, the report was acknowledged by those who had ordered the investigation at the time of the events (infra, para. 67 (h) and (p)). 60. In that report, the National Police gave an account of the investigation conducted in connection with the operation carried out on March 10, 1988, at kilometer 12 and 1/2 on the highway leading to El Salvador. In that operation, a white Ford van was seized with the following on board: Aníbal René MoralesMarroquín, Manuel de Jesús de la Cruz-Hernández, César Augusto Guerra-Ramírez, Neftalí Ramírez-García, Igloberto Pineda-Juárez and Juan José Elías-Palma, members of the Treasury Police indicated in the report as "the persons allegedly responsible for the abduction and murders" of the victims. 61. At the same time as the report, the Police delivered to the magistrate the vehicle described above, together with two others, "claiming that criminal acts had been committed on board them." The vehicles were: a white Ford Econoline 350 van; a white Nissan Cherry Vanette private minibus and a beige Chevrolet Chevy Van 20, with brown borders, at that time painted all brown. 62. The conclusions reached by the police investigators in that report were as follows: 1) The white FORD ECONOLINE 350 van with tinted windows was detained on March 10, 1988, at kilometer 12 and 1/2 on the El Salvador highway, following many complaints to the country's authorities that a series of criminal acts had been committed in it. 2) Following an exhaustive investigation by the NATIONAL POLICE DEPARTMENT, it was reliably concluded and proven that on March 10, 1988, at kilometer 12 and 1/2 on the