SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) AUGUST 14, 2002 MDU RESOURCES GROUP, INC. (Exact name of registrant as specified in its charter) DELAWARE 1-3480 41-0423660 (State or other jurisdiction of (Commission (I.R.S. Employer incorporation or organization) File Number) Identification No.) SCHUCHART BUILDING 918 EAST DIVIDE AVENUE P.O. BOX 5650 BISMARCK, NORTH DAKOTA 58506-5650 (Address of principal executive offices) Registrant's telephone number, including area code (701) 222-7900 (Former name or former address, if changed since last report.) ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS. (c) Exhibits 99(a) Statement under oath of Principal Executive Officer Regarding Facts and Circumstances Relating to Exchange Act Filings of MDU Resources Group, Inc. dated August 14, 2002 and signed by Martin A. White. 99(b) Statement under oath of Principal Financial Officer Regarding Facts and Circumstances Relating to Exchange Act Filings of MDU Resources Group, Inc. dated August 14, 2002 and signed by Warren L. Robinson. ITEM 9. REGULATION FD DISCLOSURE. On August 14, 2002, each of the principal executive officer and the principal financial officer of MDU Resources Group, Inc. filed with the Securities and Exchange Commission a statement under oath in compliance with the Commission's Order No. 4-460, dated June 27, 2002. These sworn statements are furnished as Exhibits 99(a) and 99(b) to this Form 8-K. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Dated: August 14, 2002 MDU RESOURCES GROUP, INC. By: /s/ Warren L. Robinson --------------------------- Warren L. Robinson Executive Vice President, Treasurer and Chief Financial Officer EXHIBIT INDEX Exhibit Number Description of Exhibit -------------- ---------------------- 99(a) Statement under oath of Principal Executive Officer Regarding Facts and Circumstances Relating to Exchange Act Filings of MDU Resources Group, Inc. dated August 14, 2002 and signed by Martin A. White. 99(b) Statement under oath of Principal Financial Officer Regarding Facts and Circumstances Relating to Exchange Act Filings of MDU Resources Group, Inc. dated August 14, 2002 and signed by Warren L. Robinson.