UNITED STATES 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) May 19, 2005 (May 5, 2005)


                     MDU Resources Group, Inc.
      (Exact name of registrant as specified in its charter)



        Delaware                 1-3480            41-0423660
(State or other jurisdiction  (Commission       (I.R.S. Employer
    of incorporation)          File Number)    Identification No.)




                        Schuchart Building
                      918 East Divide Avenue
                           P.O. Box 5650
                 Bismarck, North Dakota 58506-5650
             (Address of principal executive offices)
                            (Zip Code)

  Registrant's telephone number, including area code (701) 222-7900


Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant
under any of the following provisions:

   - Written communications pursuant to Rule 425 under the
     Securities Act (17 CFR 230.425)
   - Soliciting material pursuant to Rule 14a-12 under the Exchange
     Act (17 CFR 240.14a-12)
   - Pre-commencement communications pursuant to Rule 14d-2(b)
     under the Exchange Act (17 CFR 240.14d-2(b))
   - Pre-commencement communications pursuant to Rule 13e-4(c)
     under the Exchange Act (17 CFR 240.13e-4(c))


Item 8.01.  Other Events.

     In April 2005, Fidelity Exploration & Production Company,
an indirect wholly owned subsidiary of MDU Resources Group, Inc.
(MDU), announced that it had entered into Purchase and Sale
Agreements relating to the acquisition of certain natural gas
and oil producing properties in south Texas.  The acquisition
was completed on May 5, 2005.  For additional information
regarding this acquisition, reference is made to the Current
Reports on Form 8-K of MDU filed with the Securities and
Exchange Commission on April 25, 2005 and April 29, 2005.



                             SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of
1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned hereunto duly authorized.


                            MDU RESOURCES GROUP, INC.

Date  May 19, 2005          BY  /s/ Paul K. Sandness
                                Paul K. Sandness
                                General Counsel and Secretary