Nigeria’s Manual on the Laws of War states that “unlawful confinement” of persons protected under the 1949 Geneva Convention IV is a grave breach of the 1949 Geneva Conventions. 

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”.