§ 2. Crimes
Section 4
1. Anyone who commits one of the following acts shall be guilty of a crime against humanity and liable to life imprisonment or a term of imprisonment not exceeding thirty years or a sixth category fine, if such acts are committed as part of a widespread or systematic attack directed against any civilian population, with knowledge of the attack:
(e) imprisonment or other severe deprivation of physical liberty in violation of fundamental rules of international law;

Article 7
Crimes against humanity
1. For the purpose of this Statute, "crime against humanity" means any of the following acts when committed as part of a widespread or systematic attack directed against any civilian population, with knowledge of the attack:
(e) Imprisonment or other severe deprivation of physical liberty in violation of fundamental rules of international law

This provision follows the ICC Statute.