The special taskforce revealed it has frozen six bank accounts in connection with the allegation that RM2.6 billion of 1MDB funds were transferred into the personal accounts of Prime Minister Najib Abdul Razak.

While the taskforce remained tightlipped on whose accounts these were, Malaysiakini learnt that three of them belonged to the prime minister.

This was revealed by a highly placed source familiar with the ongoing investigation into the scandal that has threatened Najib’s political career.

"Yes, the three accounts are his (Najib's)," said the source, who spoke on condition of anonymity.

"We have to be careful and tread cautiously on this matter," he told Malaysiakini, but declined to reveal details on the other three accounts.

The freezing of the accounts followed four days of investigation by Bank Negara, the police, the Attorney-General's Chambers and the Malaysian Anti-Corruption Commission (MACC).

This was after a report by The Wall Street Journal alleging that US$700 million (RM2.6 billion) was deposited into Najib's personal accounts, based on information from Malaysian investigators.

On Saturday, it was reported that AG Abdul Gani Patail confirmed that the taskforce also conducted a raid on three companies last Friday and seized documents from their offices.

The three are SRC International Sdn Bhd, Gandingan Mentari Sdn Bhd, and Ihsan Perdana Sdn Bhd. It is speculated that the remaining three accounts frozen could belong to these firms.

Following the WSJ report, various quarters have called on Najib to take leave pending the outcome of the investigation.

The prime minister has denied the allegation and accused former prime minister Dr Mahathir Mohamad of masterminding the political sabotage against him.

Najib has also threatened to use the full force of the law against his critics, and is mulling suing WSJ.

WSJ has defended its report, citing it was based on investigations carried out by Malaysian authorities.

International finance magazine, Forbes had also written that Najib may have find it hard to survive this crisis.