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U.S. Currency Probe Expands to Russia, Brazil Trades

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U.S. prosecutors have expanded their probe of currency-market manipulation by some of the world’s largest banks to include the Russian ruble and Brazilian real, according to two people familiar with the matter.

The Justice Department is using cooperation agreements it reached with banks in May to gather information and interview traders about suspected market rigging, said the people, who asked not to be named because the investigation is confidential. Trading of the Argentine peso has also attracted the attention of U.S. prosecutors, one of the people said.