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Egypt
Practice Relating to Rule 80. Booby-Traps
In 1974, during discussions in the Ad Hoc Committee on Conventional Weapons established by the CDDH, the representative of Egypt stated:
14. It was generally agreed that time-delay weapons such as … booby traps, often placed far from the combat areas, could injure civilians as well as combatants and were therefore indiscriminate. Moreover, such devices generally exploded close to the victims, causing grave injuries; they also slowed up the evacuation of the sick and wounded from mined areas, thus increasing their suffering. His delegation called for prohibition of the use of weapons of that category.
15. Booby traps, often disguised as harmless devices such as pens or transistor radios, exposed civilians as well as combatants to the danger of injury from explosion and should therefore be banned. 
Egypt, Statement at the CDDH, Official Records, Vol. XVI, CDDH/IV/SR.6, 22 March 1974, p. 49, §§ 14–15.
According to the Report on the Practice of Egypt, Egypt considers that, owing to their drastic effects, some weapons, such as delayed-action weapons and booby-traps, should be prohibited in any circumstances. 
Report on the Practice of Egypt, 1997, Chapter 3.4.