Six classes of mortgage pass-through certificates from American Home Mortgage Investment Trust 2005-SDI have been downgraded by Fitch Ratings. The downgrades were as follows: group 1, class I-M2, from A to BBB, class I-M3, from BBB to B, and class I-M4, from BB to CC/DR3; and group 2, class II-M2, from A to BBB (and placed on Rating Watch Negative), class II-M3, from BBB-minus to C/DR4, and class II-M4, from B to C/DR6. Fitch also affirmed the ratings on four other classes in the scratch-and-dent transaction.
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