KUALA LUMPUR - A Malaysian government task force investigating allegations related to troubled state investor 1Malaysia Development Berhad (1MDB) has said that it is looking into accusations of multimillion ringgit deposits in a bank account purportedly controlled by Prime Minister Najib Razak's wife Rosmah Mansor.

On Thursday, the Sarawak Report news site, claiming documents from an investigation into the financial affairs of 1MDB alleged that a man had made cash deposits into the account of Datin Seri Rosmah at a Malaysian bank totalling RM2 million (S$713,000) between February and April this year.

The special task force said on Friday that it had been aware of Madam Rosmah's bank account for some time and is investigating the issue, according to news site Malaysiakini.

"The task force knew about this before the (media) expose and an investigation is being conducted," the task force said in a statement.

It said the investigation into Madam Rosmah's bank account is being carried out transparently and professionally.

"The task force hopes that all parties do not question the integrity of Bank Negara, the police and the Malaysian Anti-Corruption Commission in carrying out their duties," it added.

Last Friday, the Sarawak Report and the Wall Street Journal reported allegations of US$700 million (S$940 million) deposits in the bank accounts of Datuk Seri Najib in AmBank, the country's fifth biggest bank.

In its latest allegation on Thursday, Sarawak Report showed pictures of what it said were copies of the transactions. They showed eight alleged deposits being made into the account of Madam Rosmah in Affin Bank, Malaysia's ninth largest lender.