The presenting officer shall make an investigation following the preliminary inquiry or the release of the minor to the parents, guardian or custodian to determine whether the interests of the minor and the public require that further action be taken. Upon the basis of this investigation, the presenting officer may:
(a) Determine that no further action be taken; or
(b) File a petition pursuant to § 11.1107 of this part in the children's court to initiate further proceedings. The petition shall be filed within 48 hours of the preliminary inquiry if the minor is in shelter care. If the minor has been previously released to the parents, guardian or custodian, relative or responsible adult, the petition shall be filed within ten days of the preliminary inquiry.