Top executives at a bank and credit card firms tendered their resignations on Monday as the finance industry tried to rein in havoc from the latest massive leak of client data that regulators say may have affected roughly half of the country's 50 million people. Fears that the information fell into the hands of scammers escalated as reports were coming in of suspicious and unintended financial transactions, despite earlier statements by the firms that the culprits of the leak were caught before the information was distributed.