Соответствующая норма
Practice Relating to Rule 128. Release and Return of Persons Deprived of Their Liberty
Section G. Role of neutral intermediaries in the return process
The Report on the Practice of Colombia states:
The release and return of persons deprived of their liberty in the Colombian armed conflict are customarily guaranteed by the ICRC and sometimes other civilian social organizations such as the Church, State-controlled bodies, and journalists, subject to an accord between the parties or the exercise of the ICRC’s right of initiative. 
Report on the Practice of Colombia, 1998, Chapter 5.4.
In 1997, according to the report:
To obtain the release of 70 soldiers, the Government and the guerrillas agreed to the demilitarization of an area measuring 13,161 square kilometres in the department of Caquetá. To guarantee the suspension of military operations so that the soldiers could be handed over, the two sides agreed to the presence in the demilitarized zone of representatives of the ICRC, the National Conciliation Commission, the national Government and other competent bodies. 
Report on the Practice of Colombia, 1998, Chapter 1.8, referring to the Agreement of Remolinos de Caguán, 3 June 1997, reprinted in El Colombiano, 4 June 1997, p. 5B.