A/HRC/4/41 page 20 disappearances, was reportedly threatened and intimidated. Another key witness in the same trial, Mr. Jorge Julio López, who himself was a former victim of enforced disappearance, went missing on Monday, 18 September. 82. The Government replied to the prompt intervention letter and informed the Working Group regarding the extensive actions undertaken in the search for the missing witness and the creation of a plan to protect all witnesses in highly political cases. Meetings 83. During the seventy-ninth session, the Working Group met with government representatives to discuss outstanding cases and action being taken to clarify outstanding cases. 84. During the same session, the Working Group met with NGO representatives to discuss issues in relation to past disappearances in Argentina and recent related events. Request for a visit 85. During its seventy-fifth session, the Working Group gratefully accepted the invitation of the Government to conduct a mission to Argentina. It was decided that the mission would take place immediately following the session of the Working Group to be held in Buenos Aires in March 2007. Summary of the situation prior to the period under review 86. The vast majority of the 3,445 previously reported cases of disappearance1 occurred between 1975 and 1978 under the military Government, in the context of its campaign against left wing guerrillas and their alleged sympathizers. Two cases occurred in 2000 and concerned persons allegedly arrested in the city of Mendoza by members of the local police investigation office (Dirección de Investigaciones de la Policía). The other seven cases concerned persons who were allegedly detained by the police in 2002, following a demonstration. Total cases transmitted, clarified and outstanding 87. Of the 87 cases previously clarified by the Working Group, 44 were clarified on the basis of information provided by the Government and 43 on the basis of information provided by the source. In respect of the 3,358 outstanding cases, the Working Group is unable to report on the fate or whereabouts of the disappeared persons. Observations 88. The Working Group welcomes the creation of a comprehensive database to establish the fate or whereabouts of disappeared persons in that country by the Government. As well, the commencement of trials against perpetrators is highly commended, and should be an example to other countries. The Working Group hopes that through continued cooperation with the Government and NGOs, progress can be made towards the clarification of the 3,358 cases that remain unresolved.