Singapore's state prosecutors have declared the cross-border investigation involving embattled Malaysian state investment fund 1Malaysia Development Berhad (1MDB) the largest money laundering probe the country has ever undertaken, the Wall Street Journal reports.

The prosecutors' statements, the Wall Street Journal reports, were made Friday during a bail hearing for Yeo Jiawei, a former wealth manager at Swiss private bank BSI SA's Singapore branch, who has been charged with money laundering in relation to the 1MDB investigation.