This comes after Citi last week fired its head
of European spot foreign exchange trading Rohan Ramchandani,
following a prolonged period on leave.
The Fed and OCC officials, who have been at Citi's Canary Wharf
office in London this week, are at the preliminary stage of
information-gathering and their presence is "independent" of
Ramchandani's sacking, the source said.
The Federal Reserve and OCC, which is an independent bureau of
the U.S. Treasury, both declined to comment.
A spokesman for Citigroup also declined to comment.
Last year, Britain's Financial Conduct Authority began a formal
investigation into possible manipulation in the $5.3
trillion-a-day global FX market. The U.S. Justice Department is
also engaged in an active investigation of possible manipulation
of the market, the world's largest.
(Reporting by Jamie McGeever;
additional reporting by Aruna Viswanatha; editing by Mike Dolan,
Alex Smith and Jane Merriman)
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