SINGAPORE - A Housing Board inspection at a rental flat in Yishun due to complaints of a "cooking smell" was prompted by allegations that it was being used for illegal food catering operations, the board clarified on Friday (Oct 11). Last Thursday, Facebook user Aspa M Hatta posted a photo of a service card left by HDB staff at the rental flat on the same day. The slip told the flat occupant to call an HDB officer, citing only "cooking smell" as the reason.