Credit Suisse Group put more than $1.7 billion of mortgage-backed securities seized from Thornburg Mortgage Inc. up for auction Thursday.

The securities, backed by prime and alternative-A loans, were held as collateral and released Wednesday, after Thornburg said it would file for bankruptcy protection. The securities range in value from single digits to 80 cents on the dollar, according to a list of assets up for sale. They include $1 billion of interest-only bonds.

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