Creditors of Lehman Brothers want a federal judge to look into why JPMorgan Chase & Co. "froze" billions of Lehman's assets in the days before Lehman's bankruptcy, saying it may have contributed to the investment bank's demise.

The committee representing unsecured creditors in Lehman's bankruptcy case wants to look at the books and to question officials of JPMorgan Chase, Lehman's largest secured creditor, about its decision to freeze Lehman's account.

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