Shares of CoreStates Financial Corp. strenthened further Wednesday amid persistent rumors that the Philadelphia banking company is a takevoer target of either PNC Fiancial Corp. or First Fidelity Bancorp.

CoreStates stock was up 50 cents a share, to $52.25, in afternoon trading and has improved 15% in May after lagging other bank stocks during most of the year. Volume has been brisk.

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