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Peter Mitchell, Tom Hays and Raphael Satter

bustedUS prosecutors have announced what they say is the biggest international money laundering prosecution in history – a $US6 billion ($A6.2 billion) trail that allegedly includes $US36.9 million ($A38.4 million) deposited in Westpac Bank accounts.

The trail was allegedly left by Costa Rica-based Liberty Reserve, a currency-transfer and payment-processing company that allowed customers to move money anonymously from one account to another via the internet with almost no questions asked, and has travelled through 17 countries, including the Westpac accounts in Australia.

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