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Nigeria
Practice Relating to Rule 100. Fair Trial Guarantees
Nigeria’s Manual on the Laws of War provides that “wilfully depriving prisoners of war and civilians of the rights to a fair and regular trial” is a grave breach of the 1949 Geneva Conventions and is considered as a serious war crime. 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 6(b) and (c).
The manual further states: “In any case, it must be ensured that no punishment is imposed on a prisoner of war without a fair trial.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 44.
Nigeria’s Geneva Conventions Act (1960) punishes any person who “whether in or outside the Federation, … whatever his nationality, commits, or aids, abets or procures any other person to commit any such grave breach of any of the [1949 Geneva] Conventions”. 
Nigeria, Geneva Conventions Act, 1960, Section 3(1).