Serious delinquencies among alternative-A loans packaged into residential mortgage-backed securities dropped for the first time in four years, "which may be a signal that RMBS performance is beginning to turn the corner," Fitch Inc. said Monday.

Alt-A delinquencies dropped to 34.1% in April from 34.4% in March, the first month-over-month decline since April 2006. A year earlier, delinquencies were 27.4%.

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