Deutsche, Citi feel the heat of widening FX investigation

``Global investigations into alleged currency market manipulation intensified on Wednesday as U.S. regulators descended on Citigroup's London offices and Deutsche Bank suspended several traders in New York, sources told Reuters. The presence of Federal Reserve and Office of the Comptroller of the Currency officials at Citi's Canary Wharf office in the east of London this week comes after Citi last week fired its head of European spot foreign exchange trading... ''