Former prime minister Najib Abdul Razak is expected to face more charges relating to 1MDB soon, MACC sources say.

Highly placed officials, who spoke to Malaysiakini on condition of anonymity, said the anti-graft body's investigators are currently working to complete new investigation papers.

This, added one source, was the reason Najib was summoned to the agency's headquarters in Putrajaya again this morning.

"This round of investigation followed new leads in the MACC probe into 1MDB.

"More charges are expected to be rolled out against him (Najib) not long from now."

The sources said Najib was summoned today to facilitate investigations under Section 23 of the MACC Act 2009, which concerns abuse of power to receive gratification.

However, they declined to reveal how many more charges are being prepared against the former prime minister, nor the subject of the investigation.

Meanwhile, MACC deputy chief commissioner Azam Baki confirmed to Malaysiakini that the agency had called Najib in again today over a fresh case.

However, Azam declined to reveal further details, saying that investigations were still ongoing.

Fifth round of questioning

Najib arrived at MACC’s Putrajaya headquarters about 10am this morning.

He spent almost seven hours at the headquarters, before leaving through another exit gate which was not accessible to the public.

A Rela officer informed the media that Najib left at about 4.30pm.

Another source with knowledge of the matter later told Malaysiakini that Najib was summoned to "give a statement on a fresh issue related to 1MDB."

This marks Najib’s fifth round of questioning by MACC over 1MDB-related cases.  

He has so far been slapped with 32 charges, 25 of which are related to 1MDB, concerning money laundering and abuse of power.

Another seven charges are related to former 1MDB subsidiary SRC International, which involve money laundering, abuse of power, and criminal breach of trust.