Related Rule
Israel
Practice Relating to Rule 13. Area Bombardment
Israel’s Manual on the Laws of War (1998) provides: “It is forbidden to regard an area with mixed military objectives and civilian objects as a single target area.” 
Israel, Laws of War in the Battlefield, Manual, Military Advocate General Headquarters, Military School, 1998, p. 38.
Israel’s Manual on the Rules of Warfare (2006) states: “Bombing a city … will not necessarily weaken the enemy’s army, it will merely cause unnecessary suffering, and such actions are morally tainted on humanitarian grounds.” 
Israel, Rules of Warfare on the Battlefield, Military Advocate-General’s Corps Command, IDF School of Military Law, Second Edition, 2006, p. 8.
The manual further states: “No area in which military targets are combined with civilian targets may be considered as merely another target.” 
Israel, Rules of Warfare on the Battlefield, Military Advocate-General’s Corps Command, IDF School of Military Law, Second Edition, 2006, p. 27.
The Manual on the Rules of Warfare (2006) is a second edition of the Manual on the Laws of War (1998).