Related Rule
Belgium
Practice Relating to Rule 99. Deprivation of Liberty
Belgium’s Law concerning the Repression of Grave Breaches (1993) of the Geneva Conventions and their Additional Protocols as amended in 1999 provides that unlawful detention of a civilian person constitutes a crime under international law. 
Belgium, Law concerning the Repression of Grave Breaches of the Geneva Conventions and their Additional Protocols, 1993, as amended in 1999, Article 1(1)(6); see also Article 1(2)(5)(crime against humanity).