Fitch Ratings said today that despite infusions of capital, the "AAA" ratings of Armonk, N.Y.-based MBIA Inc. and the bond insurer's financial guaranty subsidiaries were being placed on Rating Watch Negative.

The firm said its rating action follows a decision to update certain modeling assumptions in its ongoing analysis of the financial guaranty industry.

Fitch's action came as Standard & Poor's, examining the effects of the subprime market collapse, said that huge writedowns recorded by Citigroup and other banks may have reduced exposures, but "potentials for additional write-downs cannot be ruled out," especially if the situation for bond insurers continues to deteriorate.

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