The trader charged with orchestrating what police describe as one of Singapore’s biggest suspected investment frauds began setting off alarm bells at banks more than a year before his arrest in February, according to people familiar with the matter.

Ng Yu Zhi’s unusually large cash transfers from his trading company to his personal account prompted Oversea-Chinese Banking Corp. to file suspicious transaction reports to police as far back as 2019, the people said, asking not to be identified discussing private information. The bank shut the personal account in August 2020. Ng’s corporate account at United Overseas Bank Ltd. was closed more than a year before the 34-year-old was arrested, one of the people said.

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