Moody's Investors Service warned of possible downgrades Wednesday on ratings of the bond insurer units of Assured Guaranty Ltd. and Financial Security Assurance Holdings Ltd. over concerns about their insured portfolios.

Moody's has an insurance financial strength rating on Assured Guaranty Corp. of Aa2, two steps below the top rating, and a rating of Aa3, three steps below AAA, on Financial Security Assurance Inc.

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