Senate Banking Committee Chairman Alfonse M. D'Amato Thursday asked Chairman Alan Greenspan to explain the Federal Reserve Board's supervision of Daiwa Bank Ltd.'s New York branch, which has disclosed $1.1 billion in trading losses that had been building for 11 years.

The New York Times quoted an anonymous official of the Federal Reserve Bank of New York as saying his office discovered problems at Daiwa in 1992.

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