Exhibit 23.1 [LETTERHEAD OF ARTHUR ANDERSEN & CO.] CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in the registration statements on Forms S-8 for the USBANCORP Western Region 401(k) Plan of our report dated January 28, 1994, included in USBANCORP, Inc.'s Form 10-K for the year ended December 31, 1993, and to all references to our firm included in this registration statement. /s/ Arthur Andersen & Co. Pittsburgh, Pennsylvania October 4, 1994