DALLAS -- The Securities and Exchange Commission is investigating at least seven Oklahoma bond issues totaling $1.7 billion for potential violation of federal securities law, according to a letter and document request from the agency's enforcement division.

In the request sent to the Oklahoma Executive Bond Oversight Commission. SEC staff attorney J. Allen Overby said his division wants documents for a $608 million refinancing of Oklahoma Turnpike Authority bonds in 1992 and several bond issues for Oklahoma school cash management programs from 1990-1992.

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