JPMorgan Chase boss Jamie Dimon has labelled Wells Fargo "irresponsible" for announcing the departure of its chief executive without a replacement in place, in a rare public attack by a big US bank on a rival.

Wells Fargo announced the exit of Tim Sloan in March, after tussles with regulators who have been scrutinising the bank in the wake of a mis-selling scandal. Allen Parker, the bank's general counsel, took over on an interim basis and the bank has yet to announce a successor, whose appointment must also be vetted by the US Comptroller of the Currency.

"I think Tim

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