Related Rule
Nigeria
Practice Relating to Rule 11. Indiscriminate Attacks
The Report on the Practice of Nigeria interprets the prohibition of malicious destruction of property, buildings, churches and mosques provided for in Nigeria’s Operational Code of Conduct (1967) as a prohibition of indiscriminate attacks. 
Report on the Practice of Nigeria, 1997, Chapter 1.4, referring to Operational Code of Conduct for Nigerian Armed Forces, Federal Military Government of Nigeria, July 1967, §§ f–g.
According to the Report on the Practice of Nigeria, it is Nigeria’s opinio juris that the prohibition of indiscriminate attacks is part of customary international law. 
Report on the Practice of Nigeria, 1997, Chapter 1.4.