Former prime minister Najib Abdul Razak is expected to be slapped with additional charges tomorrow.

According to sources, it is believed the charges are related to the Anti-Money Laundering, Anti-Terrorism Financing and Proceeds of Unlawful Activities Act 2001.

It is also understood that Najib has been summoned to the MACC office this evening for further questioning.

"There will be at least three charges under money laundering. Najib will be called up this afternoon for his statement to be recorded and released.

"He will be charged tomorrow morning in Kuala Lumpur," sources said on condition of anonymity.

Najib was already scheduled to appear at the Kuala Lumpur High Court tomorrow for the mention proceedings involving three counts of criminal breach of trust and one count of abuse of power.

The former premier has claimed trial to the four charges related to former 1MDB subsidiary SRC International Sdn Bhd.  

The new charges against Najib tomorrow are also related to SRC International.

Malaysiakini has contacted attorney-general Tommy Thomas and is awaiting his response.

At a press conference after Najib was charged on July 4, Thomas who led the prosecution did not discount the possibility of more charges against the former premier.