If the public prosecutor considers that the acts for which the person is brought before him pursuant to article 393 should, due to their seriousness or complexity, be the subject of an investigation falling within the jurisdiction of an investigating division when there is no such division within the judicial court and the elements of the case appear to him to require a measure of pre-trial detention, it may request that the person be placed under judicial supervision, under house arrest with electronic surveillance or in pre-trial detention until he or she appears before the competent investigating judge by applying the last paragraph of article 394 or of article 396. If the person is remanded in custody, they must appear before the examining magistrate of the investigating division no later than the fifth working day thereafter. If he fails to do so, he shall be released automatically.