WASHINGTON — Two former Citigroup Inc. executives apologized Thursday for the bank's role in the financial crisis while at the same time absolving themselves of any role in the problems that resulted in the bank being rescued by taxpayers.

Former chief executive Charles Prince and former board member and ex-Treasury Secretary Robert Rubin both expressed general regret for the bank's problems, with Prince opening his appearance before the Financial Crisis Inquiry Commission by saying "I'm sorry." But both also suggested they were unaware of problems with collateralized debt obligations that were eventually written down to the tune of $30 billion.

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