SAN FRANCISCO — Fitch Ratings Monday downgraded the insurer financial strength rating of Assured Guaranty Corp. to AA-minus from AA and the rating of Financial Security Assurance Inc. to AA from AA-plus, citing concerns about losses on mortgage-backed securities.

Fitch also downgraded the debt ratings of U.S. holding companies Assured Guaranty US Holdings Inc. and Financial Security Assurance Holdings Ltd. to A-minus. All the ratings were removed from short-term negative watch and assigned long-term negative outlooks.

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