Allegations that huge sums were misappropriated from the Malaysian state fund through money-laundering have triggered a massive corruption scandal that has embroiled Prime Minister Najib Razak.
Prosecutors said Yak Yew Chee, a former managing director at the Singapore branch of Swiss bank BSI, helped manage funds linked to 1MDB, which was set up by Najib with the help of a close family friend, Malaysian financier Low Taek Jho.
Prosecutors said Yak, who was also a private banker to Low, forged reference letters to Swiss banks and funds, and failed to report suspicious money transfers involving accounts belonging to his client.
He was also fined Sg dollar 24,000 (USD 17,000) by a Singapore district court.
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Najib, Low and 1MDB have all strongly denied any wrongdoing.
Singapore, a regional financial hub, last year launched a probe into alleged illicit fund flows linked to 1MDB and closed down the local branches of two Swiss banks -- BSI and Falcon Private Bank -- involved in the scheme.
Singapore authorities also seized nearly USD 180 million in assets during their investigation. Half of the assets were linked to Low.
The scandal is also being investigated by Switzerland -- because Swiss banks were allegedly used to transfer illicit funds -- and the United States, where assets were purchased using allegedly laundered 1MDB money.
In July the US Justice Department filed lawsuits in the United States alleging a massive international conspiracy by Najib's relatives and associates to steal billions from 1MDB.
Swiss Financial Market Supervisory Authority FINMA said in October that during its investigation from 2012 to 2015, it found that "assets amounting to approximately USD 3.8 billion were transferred to accounts at Falcon and associated with the 1MDB Group".
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