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Draft Convention for the Protection of Civilian Populations Against New Engines of War. Amsterdam, 1938.
Safety zones - Art. 21.
Art. 21. If any State seeking to avail itself of the protection hereby afforded to safety zones commits a breach of any of the provisions relating to safety zones contained in this Convention in respect of one or more of its own safety zones, and such breach is notified as provided in the preceding article
, and the safety zone or safety zones affected by such breach are specified in such notice, it shall be lawful for any other belligerent to give notice to such State that the safety zone or safety zones concerned will after the receipt of such notice no longer be recognized as such, but it shall not be lawful to cause any injury to civilian populations by way of reprisals for such breach.