Lehman said in court papers that federal regulators have ordered the Wilmington, Del., bank, Lehman Brothers Bank FSB, to obtain more cash by Feb. 28 so it can meet certain capital requirements that will allow it to continue operating.

At the end of last year, Lehman Brothers Bank's capital had fallen about $180 million below the "adequately capitalized" level required by federal regulators, according to court papers filed Wednesday.

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