Escalating troubles at Ambac Assurance Corp. and the resulting inability of the bond insurer to make even less of a partial payment on claims than it previously expected caused U.S. Central Federal Credit Union to restate its fourth quarter results for 2009, adding $274 million in losses that came from MBS investments.

As a result, U.S. Central had losses of $750.9 million for the fourth quarter and $2.04 billion for the full year. U.S. Central, which has been run under a National Credit Union Administration's conservatorship program since March 2009, had a loss of $4.9 billion for 2008. Financial troubles at Ambac caused its regulator, the Wisconsin Insurance Commissioner, to issue an order restricting the company's activities and its ability to pay bond claims.

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