I concurred with Photobug.
Do not take any prejudicial actions if the case is under police investigation.
Patience is the essence in such case.
You may monitor the weekly hearing list at the Subordinate Courts, look for any person charged under Sec 403, Penal Code Cap 224, e.g.
DAC XXXXX/2005
PP vs XYZ
Sec 403 PC Cap 224
http://www.subcourts.gov.sg/hearing_list_courts.doc
If your patience is wearing thin, you "may try" to seek alternative legal redress [Under Sec 133(1) of the criminal procedure code Cap 68] by lodging a Magistrates' Complaint at the Subordinate Courts with the following form :
http://www.subcourts.gov.sg/criminal/forms/Complaint.pdf
You will have to pay a fee of S$1.00 if a Summons or a Warrant of Arrest is issued by the Magistrate against the Respondent.