Barclays, Citigroup FX Trader Messages Said to Be Examined

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An instant-message group involving senior traders at banks including Barclays Plc, Citigroup Inc. and Royal Bank of Scotland Group Plc is being scrutinized by regulators investigating potential manipulation of the foreign-exchange market, four people with knowledge of the probe said.

Over a period of at least three years, the dealers exchanged messages through Bloomberg terminals outlining details of their positions and client orders, and made trades before key benchmarks were set, said two of the people, who asked not to be identified because the inquiries are continuing.