Eight classes from two issues of CitiMortgage Alternative Loan Trust mortgage pass-through certificates have been downgraded by Fitch Ratings.The downgrades were as follows: series 2006-A4, class B-2, from A to A-minus, class B-3, from BBB to BB-plus, class B-4, from BB to B, and class B-5, from B to C/DR5; and series 2006-A6, class B-2, from A to A-minus, class B-3, from BBB to BB-plus, class B-4, from BB to B-plus, and class B-5, from B to C/DR4. Fitch also affirmed the ratings on four classes in the two transactions. The downgrades were attributed to "current trends in the relationship between serious delinquency and credit enhancement." The collateral in the deals consists of fixed-rate alternative-A mortgage loans.

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