(c) the engagement of such number of marshals and security officers as may be necessary to ensure that good order and public safety shall be maintained throughout the assembly or procession, as the case may be; and (d) the place or places where the public assembly or public procession may, or may not, be carried on. (4) The Commissioner may, if he reasonably believes that it is necessary in order to prevent anything referred to in section 7(2)(a) to (h) from happening — (a) impose additional conditions on those organising or taking part in an assembly or a procession authorised by a permit; or (b) amend any condition previously imposed under subsection (2) or paragraph (a), and the senior police officer may give directions to those organising or taking part in the assembly or procession to ensure the due observance of any condition imposed under subsection (2). [Act 23 of 2017 wef 01/10/2017] (5) Any reference in this Act to a condition imposed under subsection (2) shall, except where the context otherwise requires, include reference to an additional condition or amendment to such a condition imposed under subsection (4). (6) In this section — “assembly” and “procession” include the period of first assembly of the assembly and procession, respectively, to the time it disbands; “senior police officer” means the most senior in rank of the police officers present at the scene of the assembly or procession, or any one of them if there are more than one of the same rank. Form and validity of permit 9. A permit granted under section 7 shall — (a) be in such form as the Commissioner may determine; (b) contain the conditions subject to which it is granted; and (c) unless earlier cancelled by or under this Act, be valid — (i) in respect of the holding of such particular public assembly or public procession specified in the permit; or Singapore Statutes Online Current version as at 01 Oct 2018 PDF created date on: 01 Oct 2018