Standard & Poor's last week downgraded bond insurer Radian Asset Assurance Inc. to BBB-minus from BBB-plus in a move related to downgrades of parent Radian Guaranty Inc. and all other major U.S. mortgage insurers. The rating remains on negative watch.

Standard & Poor's attributed the downgrades of the mortgage insurers to an increase in its loss cost assumptions due to an increase in its assumptions for peak unemployment and the sharp rise in delinquent loans.

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