Bond insurers including Assured Guaranty and MBIA Inc. are on the hook for almost $16 billion of Puerto Rico debt as a new administration there aims to curb speculation that the U.S. territory could go the way of Detroit.

Total net par outstanding exposure to Puerto Rico bonds by Assured, MBIA's National Public Finance Guarantee, Ambac Assurance Corp., Syncora Guarantee and Financial Guarantee Insurance Corp was $15.7 billion by June 30, according to an analysis by the Bond Buyer. The financial guarantors have wrapped a wide spectrum of Puerto Rico debt, from commonwealth general obligations to below investment-grade aqueduct and sewer bonds.

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