DALLAS - The Securities and Exchange Commission has subpoenaed five current members and one former member of the Oklahoma Turnpike Authority to give depositions this month about agency bond issues and underwriter selection during the past five years, officials said on Friday.

The request for depositions appears to be part of an ongoing SEC investigation into potential securities laws violations that was started last fall when the agency's enforcement division asked for documents on turnpike and school cash management program bond issues.

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