SAN FRANCISCO - Wells Fargo & Co. said Monday that it would file with the Justice Department and the Federal Trade Commission its intention to purchase more than 15%, or $15 million, of voting securities of First Interstate Bancorp.

Wells Fargo, based in San Francisco, will make the so-called Hart-Scott- Rodino Act filings in order to show its "commitment" to its unsolicited offer to buy First Interstate for more than $10 billion in stock, said Wells Fargo spokeswoman Lorna Doubet.

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