Chapter II
Crimes
Section II
War crimes
Article 10
War crimes against persons
1. Anyone who, in the context of an international armed conflict or a non-international armed conflict, commits any of the following acts against a person protected by international humanitarian law:
(f) Taking of hostages;
shall be punished with a term of imprisonment of 10 to 25 years.
Taking of hostages - IAC
Taking of hostages - NIAC
EDIT.