FILED BY THE PNC FINANCIAL SERVICES GROUP, INC.
                       PURSUANT TO RULE 425 UNDER THE SECURITIES ACT OF 1933 AND
     DEEMED FILED PURSUANT TO RULE 14A-12 OF THE SECURITIES EXCHANGE ACT OF 1934

                                     SUBJECT COMPANY: RIGGS NATIONAL CORPORATION
                                                   COMMISSION FILE NO. 000-09756

ON MARCH 3, 2005, THE PNC FINANCIAL SERVICES GROUP, INC. ("PNC") AND RIGGS
NATIONAL CORPORATION ("RIGGS") JOINTLY ISSUED THE ATTACHED PRESS RELEASE
RELATING TO THE PROPOSED ACQUISITION BY PNC OF RIGGS:



                               RIGGS AND PNC ENTER
             AGREEMENT IN PRINCIPLE TO SETTLE STOCKHOLDER LITIGATION

PITTSBURGH and WASHINGTON, March 3, 2005 /PRNewswire-FirstCall/ -- The PNC
Financial Services Group, Inc. (NYSE: PNC) and Riggs National Corporation
(Nasdaq: RIGS) today announced that they have entered into an agreement in
principle with plaintiffs' counsel to settle previously disclosed litigation
asserting purported derivative and class action claims against certain current
and former members of the Riggs Board of Directors. The litigation, which was
brought in the Delaware Court of Chancery, relates, among other things, to
alleged violations by the Riggs board of directors of their fiduciary duties in
connection with compliance by Riggs with various anti-money laundering laws and
the proposed merger agreement between PNC and Riggs.

"PNC and Riggs have agreed in principle to the settlement of the actions to
eliminate the burden and expense of further litigation," Riggs stated.

"The settlement is an additional step in our continued progress toward
completing the merger and entering the appealing Washington, D.C. marketplace.
We are pleased that this matter has been resolved," said PNC Chairman and Chief
Executive Officer James E. Rohr.

In the settlement, PNC, as successor to Riggs, will contribute $2.7 million in
cash into a settlement fund to be distributed to all public stockholders of
Riggs (other than the persons named as defendants in the Delaware action and
their affiliates). An eligible stockholder will receive a distribution from the
fund, following the closing of the pending merger between PNC and Riggs, in
proportion to that stockholder's ownership of Riggs common stock held by
eligible stockholders. In addition, PNC has agreed that the maximum amount of
the termination fee payable under the parties' amended merger agreement will be
reduced from $30,000,000 to $23,000,000, and plaintiffs' counsel in the action
was afforded the opportunity to review and comment on the proxy
statement/prospectus filed relating to the merger before it was filed on
February 25, 2005.

The settlement will provide for a dismissal of the Delaware litigation with
prejudice and the complete release of all claims that Riggs and Riggs
stockholders during the period from July


15, 2004 through the completion of the merger may have against Riggs, the Riggs
director defendants or PNC arising out of or related to Riggs' banking
practices or the proposed merger.

The settlement is subject to completion of the merger and customary conditions,
including negotiation of a definitive settlement agreement and approval by the
Delaware Court of Chancery. Upon approval of the proposed settlement by the
court, plaintiffs' attorneys are expected to apply for an award of attorneys'
fees and expenses of $1.1 million to be paid by PNC, as successor to Riggs. In
the event the Delaware Court approves the settlement and enters judgment
dismissing the litigation, the shareholder plaintiff in a related derivative
lawsuit filed in the District of Columbia will join Riggs and its directors in a
motion to dismiss that suit based on the Delaware judgment.


ADDITIONAL INFORMATION ABOUT THE MERGER

The PNC Financial Services Group, Inc. and Riggs have filed a proxy
statement/prospectus and other relevant documents concerning the merger with the
United States Securities and Exchange Commission (the "SEC"). We urge investors
to read the proxy statement/prospectus and any other documents to be filed with
the SEC in connection with the merger or incorporated by reference in the proxy
statement/prospectus, because they will contain important information. Investors
will be able to obtain these documents free of charge at the SEC web site
(HTTP://WWW.SEC.GOV ). In addition, documents filed with the SEC by The PNC
Financial Services Group, Inc. will be available free of charge from Shareholder
Relations at (800) 843-2206. Documents filed with the SEC by Riggs will be
available free of charge from HTTP://WWW.RIGGSBANK.COM.

The directors, executive officers, and certain other members of management of
Riggs may be soliciting proxies in favor of the merger from its shareholders.
For information about these directors, executive officers, and members of
management, stockholders are asked to refer to Riggs's most recent annual
meeting proxy statement, which is available on Riggs's website
(HTTP://WWW.RIGGSBANK.COM ) and at the addresses provided in the preceding
paragraph.

Riggs Bank N.A. is the primary operating subsidiary of Riggs National
Corporation, the largest bank holding company headquartered in the nation's
capital. Riggs commands the largest market share in the District of Columbia and
specializes in banking and financial management products and services for
individuals, nonprofit organizations and businesses.

The PNC Financial Services Group, Inc. is one of the nation's largest
diversified financial services organizations, providing regional community
banking; wholesale banking, including corporate banking, real estate finance and
asset-based lending; wealth management; asset management and global fund
services.