In the latest development in the inquiry against former Mumbai top cop Param Bir Singh, the Central Bureau of Investigation (CBI) has registered three Preliminary Enquiries (PEs) against him and others following directions from the apex court.

The PEs are not FIRs but a process to collect and check prima faice evidences on the basis of witnesses' account, documents etc. If prima facie a case is made out, the CBI will then convert these PEs into FIRs.