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Draft Convention for the Protection of Civilian Populations Against New Engines of War. Amsterdam, 1938.
Safety zones - Art. 10.
Art. 10. For the purpose of better enabling a State to obtain protection for the non-belligerent part of its civil population, a State may, if it thinks fit, declare a specified part or parts of its territory to be a "safety zone" or "safety zones" and, subject to the conditions following, such safety zones shall enjoy immunity from attack or bombardment by whatsoever means, and shall not form the legitimate object of any act of war.