WASHINGTON — The Securities and Exchange Commission is sharply disputing the claims of a bond dealer and Alabama city official that it does not have jurisdiction to investigate possible fraud in connection with Jefferson County, Ala.’s interest rate swaps agreements.

In a 16-page brief filed Friday with the U.S. District Court for the Southern District of Florida in Miami, the commission also rejected the claim of Birmingham Mayor Larry P. Langford and William B. Blount, of Blount Parrish & Co., that it must tell them if there is a parallel criminal inquiry in order for them to testify in the investigation.

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