Singapore's central bank has asked financial institutions to provide details of any transactions linked to Malaysian state investor 1Malaysia Development Berhad (1MDB) as part of its probe into possible money-laundering in the city state. The statement came late Thursday after it was reported earlier this week that the Monetary Authority of Singapore (MAS) has reportedly asked close to 40 banks with a presence in Singapore to provide information linked to 1MDB. Australia and New Zealand Banking Group (ANZ) and National Australia Bank (NAB) are believed to be among those queried. ANZ and NAB both declined to comment.