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El Salvador
Practice Relating to Rule 117. Accounting for Missing Persons
Section C. International cooperation to account for missing persons
El Salvador’s Decree Creating the National Commission for Tracing Missing Children (2010) states:
Art. 1.- The National Commission for Tracing Girls and Boys Missing during the Internal Armed Conflict, which will be referred to as “Commission” or “Tracing Commission” hereinafter.
Art. 3.- The Commission shall have the mandate to:
f) Promote … the participation of private … international … organizations, to implement actions that will contribute to determining the whereabouts of the missing girls and boys. 
El Salvador, Decree Creating the National Commission for Tracing Missing Children, 2010, Articles 1–3(f).
The Decree also states: “The Tracing Commission … may communicate and coordinate with international governmental, intergovernmental and nongovernmental organizations in order to execute its mandate.” 
El Salvador, Decree Creating the National Commission for Tracing Missing Children, 2010, Article 6.
In 2008, in its third and fourth periodic reports to the Committee on the Rights of the Child, El Salvador stated:
The fieldwork [of the Inter-Institutional Commission to search for children who disappeared owing to armed conflict in El Salvador] includes interviews … with officials of … international institutions, such as … the International [Committee of the] Red Cross … , from which valuable and important information has been obtained. 
El Salvador, Third and fourth periodic reports to the Committee on the Rights of the Child, 23 July 2009, UN Doc. CRC/C/SLV/3-4, submitted 21 February 2008, § 383.