Moody's Investors Service Inc. downgraded its ratings on $484.7 million in jumbo residential mortgage-backed securities Tuesday, continuing the rating agency's spate of downgrades in recent weeks.

Delinquency rates on jumbo loans, issued to homeowners needing at least $417,000 in financing, have been increasing faster than for other home loans on a month-to-month basis. However, the rate remains well below those on other types of loans.

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