Source: https://ihl-databases.icrc.org/customary-ihl/eng/docs/v2_cou_nz_rule103
Timestamp: 2019-04-21 23:35:08+00:00

Document:
New Zealand’s Military Manual (1992), referring to Articles 32–34 of the 1949 Geneva Convention IV, states: “The following are … prohibited: a. the punishment of a protected person for an offence not committed by him personally; b. collective penalties”.
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 1116(2)(a) and (b).
The manual reproduces Article 75(2) of the 1977 Additional Protocol I.
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 1137.
With regard to the control of persons in occupied territory, the manual also states: “Impermissible measures of population control include: … punishments for acts of others, that is … collective penalties”.
Until and during World War II, Occupying Powers occasionally sought to secure observance of the law of armed conflict by the inhabitants of the occupied territory by the imposition or threat of collective penalties. Such action was contrary to HR Art. 50, and any collective penalties are now expressly forbidden by [the 1949 Geneva Convention IV] Art. 33 and [the 1977 Additional Protocol I] Art. 75 (2)(d).
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 1608.
Although [the 1977 Additional Protocol II] contains no provisions relating to enforcement or punishment of breaches, it does contain a statement of fundamental guarantees prohibiting at any time and anywhere: … collective punishment.
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 1812(1)(b).

References: § 1116
 § 1137
 Art. 50
 Art. 33
 Art. 75
 § 1608
 § 1812