The moves, which are voluntary, show how lenders are trying to close loopholes that enabled a group of criminals from China to launder more than $3 billion in proceeds from online gambling through at least 16 financial institutions in the island nation. The scandal has tarnished Singapore’s image and exposed weaknesses in how local and foreign banks and brokerages screen their clients.
Citigroup Inc., DBS Group Holdings Ltd. and other banks caught up in Singapore’s biggest money-laundering scandal are ramping up scrutiny of their wealthy customers and potential clients to avoid exposure to illicit flows, according to people familiar with the matter.
Private bankers at several institutions are also receiving additional training to help them spot tricks used by criminals to mask their backgrounds and sources of funds, said the people, who asked not to be identified discussing private matters.

