Forty-six classes of residential mortgage-backed securities supported by a financial guaranty policy provided by Ambac have been downgraded by Fitch Ratings. The ratings of 18 other such classes were affirmed and removed from Rating Watch Negative, while the downgraded classes remain on Rating Watch Negative. The actions followed Fitch's downgrade of the insurer financial strength rating of Ambac and its financial guaranty insurance subsidiaries to AA/Rating Watch Negative. The rating agency can be found on the Web at http://www.fitchratings.com.

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