Соответствующая норма
Practice Relating to Rule 128. Release and Return of Persons Deprived of Their Liberty
Section A. Release and return without delay
Zimbabwe’s Geneva Conventions Act (1981), as amended in 1996, punishes “any person, whatever his nationality, who, whether in or outside Zimbabwe, commits any such grave breach of … [the 1977 Additional Protocol I]”. 
Zimbabwe, Geneva Conventions Act, 1981, as amended in 1996, Section 3(1).
According to the Report on the Practice of Zimbabwe, it is the opinio juris of Zimbabwe that persons detained by reason of their participation in an internal armed conflict should be released or repatriated without delay at the end of active hostilities. 
Report on the Practice of Zimbabwe, 1998, Chapter 5.4.