Without prejudice to the rules on cross-border cooperation and mutual legal assistance in criminal matters, Member States' authorities, Europol, Eurojust, the European Public Prosecutor's Office, the European Anti-Fraud Office (OLAF) and the Commission shall, within their respective competences, cooperate with each other in the fight against the criminal offences referred to in this Directive. To that end, where appropriate, Europol, Eurojust, the European Public Prosecutor's Office, the European Anti-Fraud Office (OLAF), and the Commission shall provide technical and operational assistance in accordance with their respective mandates to facilitate the coordination of investigations and prosecutions by the competent authorities.