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                           SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549

                                    SCHEDULE 14D-1

                                  (Amendment No. 12)


                             Tender Offer Statement
         (Pursuant to Section 14(d)(1) of the Securities Exchange Act of 1934)


                                   ADT Limited
                            (Name of Subject Company)

                                Western Resources, Inc.
                                 Westar Capital, Inc.
                                    (Bidders)

                     Common Stock, Par Value $0.10 Per Share
                         (Title of Class of Securities)

                                      000915108
                      (CUSIP Number of Class of Securities)

                                John K. Rosenberg
                     Executive Vice President and General Counsel
                                 Western Resources, Inc.
                                   818 Kansas Avenue
                                  Topeka, Kansas 66612
                                 Phone: (913) 575-6300

                     (Name, Address and Telephone Number of Person
                    Authorized to Receive Notices and Communications
                              on Behalf of Bidders)




                                    Copy to:

                                Neil T. Anderson
                               Sullivan & Cromwell
                                125 Broad Street
                            New York, New York 10004
                                 (212) 558-4000











This  Amendment  No.12  amends and  supplements  the Tender  Offer  Statement on
Schedule 14D-1 (the "Schedule  14D-1"),  originally filed by Western  Resources,
Inc., a Kansas corporation ("Western Resources"),  on March 17, 1997 relating to
the exchange offer disclosed  therein to exchange all of the outstanding  Shares
for shares of Western  Resources  Common Stock upon the terms and subject to the
conditions  set forth in the  Prospectus,  dated March 14, 1997, and the related
Letter of Transmittal.  Capitalized terms used and not defined herein shall have
the meanings set forth in the Schedule 14D-1.


Item 11.          Material to be Filed as Exhibits.

         Item 11 is  hereby  amended  and  supplemented  by adding  thereto  the
following:

(a)(14)      News release/employee update issued by Western Resources, Inc.
             on July 2, 1997.







                                    SIGNATURE

         After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


                                                WESTERN RESOURCES, INC.

Date       July 2, 1997                        By   /s/ JERRY D. COURINGTON
     -----------------------                      -------------------------
                                                      Jerry D. Courington,
                                                         Controller







                                INDEX TO EXHIBITS


                                                                    Sequentially
                                                                        Numbered
Exhibit No.                     Description                           Pages

(a)(14)           News release/employee update issued by                1
                     Western Resources, Inc. on July 2, 1997


















































                                                  Exhibit No. (a)(14)

The following news release/employee update was issued by Western Resources,
Inc. on July 2, 1997:

WESTERN RESOURCES STANDS
TO GAIN MORE THAN $700 MILLION,

CONTINUES SECURITY GROWTH
WITHOUT ADT

TOPEKA,  Kansas,  July 2, 1997 (2:00 p.m.  CDT) -- Western  Resources  (NYSE:WR)
today  announced it stands to gain $710 million at today's  conversion  price on
its 38 million shares of ADT Limited common stock.  At the current market price,
the  company's  ADT stock is worth  more than $1.3  billion.  Since its  initial
investment in December  1995,  Western  Resources'  $590 million in ADT holdings
have been financed entirely with short-term borrowings. "Our innovative strategy
of investing  in the  security  business has paid off in two ways -- a huge gain
through ADT and a leading position in the industry as the third largest security
company in the country," said John E. Hayes, Jr., Western Resources  chairman of
the board and chief  executive  officer.  In light of the premium  price paid by
Tyco for ADT, Western  Resources is today withdrawing its exchange offer for ADT
while it continues to pursue legal action in Bermuda  seeking to receive cash at
the full value of the ADT  shares.  Hayes also said the market  place can expect
more innovative moves from Western Resources.

"We have  announced  a  creative  strategic  alliance  with  ONEOK to handle our
natural gas  operations,  giving us 45 percent  ownership in the 8th largest gas
company in the  nation,"  he said.  "Combine  that with our Kansas  City Power &
Light merger and our international  business,  through our subsidiary,  The Wing
Group,  and we are growing our company to meet consumer  demands while providing
tangible shareowner value."

Western Resources (NYSE:WR) is a full-service,  diversified  security and energy
company with total assets of more than $6 billion.  Its utilities,  KPL and KGE,
operating in Kansas and Oklahoma,  provide natural gas service to  approximately
650,000  customers  and electric  service to  approximately  600,000  customers.
Western  Resources,   through  its  subsidiary  Westar  Security,  also  is  the
third-largest monitored security provider in the country, operating in 46 states
in the U.S. Through its other subsidiaries,  Westar Energy,  Westar Capital, and
The Wing Group, a full range of energy and energy-related  products and services
are  developed  and  marketed in the  continental  U.S. and  offshore.  For more
information about Western Resources and its operating companies, visit us on the
Internet at http://www.wstnres.com.

This news release/employee update is neither an offer nor an exchange
nor a solicitation of an offer to exchange shares of common stock of ADT
Limited. Such offer is made solely by the Prospectus dated March 14, 1997, and
the related Letter of Transmittal, and is not being made to, nor will tenders
be accepted from or on behalf of, holders of shares of common stock of ADT
Limited in any jurisdiction in which the making of such offer or the
acceptance thereof would not be in compliance with the laws of such
jurisdiction. In any jurisdictions where securities, blue sky or other laws
require such offer to be made by a licensed broker or dealer, such offer shall
be deemed to be made on behalf of Western Resources, Inc. by Salomon Brothers
Inc; Bear, Stearns & Co. Inc; and Chase Securities Inc, or one or more
registered brokers or dealers licensed under the laws of such jurisdiction.