Anwar said more astonishingly the deal to sell the investment was sealed on March 31, 2010, the last day of 1MDB's financial year.

"This sleight of hand accounting is a blatant attempt to show the dubious profit that Najib declared," he added.

"What is also as explosive is that Sarawak Chief Minister Taib Mahmud's connection to 1MDB and the dubious transactions it recorded.

"Last year, PetroSaudi paid over RM1.5 billion to take over UBG Berhad, the financial arm of the business empire of Taib Mahmud's family that was facing difficulties.

He said in the light of the massive and unprecedented spending and political bribery seen in the Sarawak elections, Pakatan Rakyat demands the appointment of a special audit team to probe the transactions involving 1MDB, PetroSaudi and UGB to ascertain whether the government money been used for setting up a political slush fund.

He also called for an immediate halt to 1MDB's efforts to raise more funds from banks until the probe is completed.

Anwar also called for a freeze on any attempt by the Barisan Nasional to transfer any government property to 1MDB, such as the plan to award the company a prime piece of real estate in Jalan Cochrane.

"There should be a full disclosure of who is behind PetroSaudi and 1MDB and whether 1MDB is financially sound to meet all its obligations to repay the loan," he said.