First Bank System Inc.'s controversial share-repurchase program is now the subject of at least three lawsuits that claim the bank is manipulating its stock price in an effort to inflate its bid for First Interstate Bancorp.

Wells Fargo & Co. filed an amended complaint in Delaware Chancery Court last week, adding an allegation - to an original complaint filed in mid- November - that First Bank had illegally manipulated the market price of its shares through the buybacks. Wells Fargo has launched a hostile tender offer for First Interstate.

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