Three of the six frozen accounts belonged to Prime Minister Datuk Seri Najib Razak, unnamed sources told news portal, The Malaysian Insider.

Two of the accounts were from Ambank and Affin Bank, sources told the portal.

The multi-agency task force probing the alleged 1Malaysia Development Berhad (1MDB) funds transfer said six bank accounts related to the investigation have been frozen.

The accounts were frozen following a Wall Street Journal (WSJ) report alleging RM2.6 billion of 1MDB funds were transferred to Najib’s personal bank account.

The joint statement signed by Attorney-General Tan Sri Abdul Gani Patail, Bank Negara Governor Tan Sri Zeti Akhtar Aziz, Inspector-General of Police Tan Sri Khalid Abu Bakar and Malaysian Anti-Corruption Commission Chief, Tan Sri Abu Kassim Mohamed, said the order to freeze the six accounts was issued on July 6.

“We have also collected documents linked to 17 accounts from two banks, as part of our ongoing investigation," they said in the joint-statement.

In its article published last Friday, WSJ alleged that 1MDB funds amounting to US$700 million (RM2.6 billion) had been channelled to the premier's personal account, a claim denied by both Najib and 1MDB.

Several parties have since urged the Prime Minister to take legal action against WSJ to clear his name and defend the government’s integrity.

Attorney-General Tan Sri Abdul Gani Patail in a statement said authorities are currently investigating three companies linked to the WSJ allegations which had also been reported by the Sarawak Report.