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RALEIGH, N.C. -- North Carolina's top utilities regulator has been subpoenaed as part of the broadening criminal investigation triggered by last month's massive coal ash spill that coated 70 miles of the Dan River with toxic sludge.

The North Carolina Utilities Commission on Wednesday released a copy of the subpoena ordering board chairman Edward S. Finley to testify before a federal grand jury later this month.

The summons issued by the U.S. Attorney in Raleigh is dated Feb. 18 and requires Finley to also provide reams of documents related to the state commission's oversight of Duke Energy coal ash dumps like the one that ruptured.

The latest subpoena is at least the 23rd issued in the wake of the Feb. 2 spill. North Carolina's environmental agency received 20. Duke Energy confirms receiving two.

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