By way of derogation from Article 11(2), (4), (5) and (6) and from Article 12, a Member State, in the event of serious threats to, or attacks on, public security as a result of illicit possession or use of explosives or ammunition, may take all necessary measures concerning transfers of explosives or ammunition in order to prevent such illicit possession or use.
The measures referred to in the first paragraph shall respect the principle of proportionality. They shall constitute neither a means of arbitrary discrimination nor a veiled restriction in trade between Member States.
Each Member State which adopts such measures shall notify the Commission of them forthwith. The Commission shall inform the other Member States thereof.