1. Competent authorities shall cooperate with each other whenever necessary for the purpose of carrying out their duties, making use of their powers whether set out in this Directive or in national law. Competent authorities shall render assistance to competent authorities of other Member States. In particular, they shall exchange information and cooperate in investigation activities.
2. Competent authorities shall, on request, immediately supply any information required for the purpose referred to in paragraph 1. Where necessary, the competent authorities receiving any such request shall immediately take the necessary measures in order to gather the required information. If the requested competent authority is not able to supply the required information immediately, it shall notify the requesting competent authority of the reasons. Information thus supplied shall be covered by the obligation of professional secrecy to which the persons employed or formerly employed by the compete