SINGAPORE • Investigators from Singapore and Malaysia have been meeting to share information about probes related to 1Malaysia Development Berhad (1MDB), according to the authorities in the Republic.

Malaysia is working with several countries, including Singapore, on what is alleged to be a US$4.5 billion (S$6.1 billion) fraud from the state investment fund. The investigation has quickened since Prime Minister Mahathir Mohamad's shock election win in May.

Former prime minister Najib Razak, who faces four charges for offences tied to 1MDB, pleaded not guilty on Wednesday in Malaysia's High Court.

Singapore has fined eight banks and sent four people to jail over the scandal. "Low Taek Jho and (close business associate) Tan Kim Loong remain key persons of interest to Singapore," a police representative said in response to Bloomberg News queries.

"Singapore has been providing Malaysia with information on 1MDB-related fund flows, since March 2015 to date, and this has been acknowledged by Malaysia."

Officials from the two countries met on May 31 near Kuala Lumpur.

"Since the second meeting between the Malaysian and Singapore authorities on June 7, the law enforcement agencies in both jurisdictions have followed up with several more meetings in Singapore," the police representative said by e-mail.

BLOOMBERG