Fitch Ratings issued a flurry of rating actions Oct. 29 that included downgrades of 51 classes of mortgage-backed securities.Fitch also placed seven classes of MBS on Rating Watch Negative and affirmed the ratings on 67 classes. Among the securities affected by the downgrades were: 26 classes from six issues of Structured Asset Investment Loan mortgage pass-through certificates and 14 classes from three issues of Amortizing Residential Collateral mortgage pass-throughs. The negative rating actions were attributed chiefly to a deterioration in the relationship between credit enhancement and loss expectations, although one was linked to changes in Fitch's subprime loss forecasting assumptions. The rating agency can be found online at http://www.fitchratings.com.

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