(8)If the Director, Additional Director or Assistant Director of Serious Fraud Investigation Office authorised in this behalf by the Central Government by general or special order, has on the basis of material in his possession reason to believe (the reason for such belief to be recorded in writing) that any person has been guilty of any offence punishable under sections referred to in sub-section (6), he may arrest such person and shall, as soon as may be, inform him of the grounds for such arrest.