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Agreement supplementary to The Nyon Agreement. Geneva, 17 September 1937.
II. The present Agreement applies to any attack by a surface vessel or an aircraft upon any merchant vessel in the Mediterranean not belonging to either of the conflicting Spanish parties, when such attack is accompanied by a violation of the humanitarian principles embodied in the rules of international law with regard to warfare at sea, which are referred to in Part IV of the Treaty of London of 22 April 1930, and confirmed in the Protocol signed in London on 6 November 1936.