Former premier Najib Abdul Razak may be "disappointed" that the police are not probing him over several high-profile murders as there is no lead to link him to any of the murders.

A well-placed police source said that police could only investigate Najib if there is a development linking him to the murders, but so far, there is none.

Last Sunday, Najib took to Facebook to question why the Pakatan Harapan government had yet to reopen investigations on him on the matter...