Police will not open an investigation into a report filed by former premier Najib Abdul Razak's aide on DAP veteran Lim Kit Siang's claims regarding several high-profile murders.

"There's nothing to investigate,” Sentul district police chief S Shanmugamoorthy Chinniah told Malaysiakini.

He said the matter has been classified as a civil action and would be referred to the magistrate for further action.

“Najib wants to defend himself (against Lim's claims). There is nothing to investigate there. It is more like (a case involving) slander, but we are not investigating.... Civil action can be taken,” he added.

Yesterday, Malaysiakini had sighted the report filed by the aide with the Sri Hartamas police station.

The complainant urged the police to investigate Lim based on a Malaysiakini article where the latter said he would reopen investigations into the deaths of Altantunya Shaariibuu, Kevin Morais, Hussain Najadi, Teoh Beng Hock and Ahmad Sarbani Mohamed, if he were prime minister.

On Thursday, Najib said he would instruct an aide to file a police report against him so the authorities can investigate if he was involved in the murders.

The former premier said this would be the last resort for him to clear his name.