Classes A-1 and A-2 of Diversified Asset Securitization Holdings I LP have been downgraded from A-minus to BB by Fitch Ratings.Fitch attributed the downgrades to deterioration in the credit quality of DASH's collateral portfolio. DASH I is a collateralized debt obligation managed by AAM Co. Fitch said 47.2% of the portfolio backing the CDO consists of residential mortgage-backed securities, and the remainder consists of commercial MBS (34.9%), asset-backed securities (13.2%), and other CDOs (4.7%).

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