Citigroup Inc. and Bank of America Corp. tumbled to 13-year intraday lows Thursday before erasing some of those declines as gloomy economic reports exacerbated general market fears and investors contemplated changes to the Treasury's bailout plan.

Separately, Citigroup's board issued a statement signaling support for its chairman, Sir Win Bischoff, after reports surfaced about tension among the bank's directors.

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