Twenty-eight classes from four alternative-A mortgage-backed securities deals have been downgraded by Fitch Ratings. The downgraded securities included the following: 11 classes from Credit Suisse Mortgage Corp. Trust 2007-5, group I; seven classes from CSAB Mortgage-Backed Trust 2007-1, group 2; five classes from Bear Stearns ALT-A Trust 2006-7, group II; and five classes from GMAC Mortgage Trust 2005-AF1. The rating agency attributed the downgrades to expected defaults and losses from delinquent loans and projected losses from the currently performing pools.
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