The authority also conceded that it had failed to respond quickly to allegations of so-called lowballing, in which managers altered submissions to the London interbank offered rate, or Libor, to portray their firms in a healthier financial position.
The Barclays case included incriminating e-mails from traders, who asked colleagues to alter Libor submissions to benefit their own trading positions.
Mr. del Missier, however, said the e-mail outlining the conversation between Mr. Tucker and Mr. Diamond represented an instruction from government officials to alter Barclays Liborr submissions.
The individuals, who communicated with colleagues about the rate-setting through emails and instant messages, also altered rate submissions to benefit traders at other banks.
In the latest regulatory action against Royal Bank of Scotland, Japanese authorities said on April 5 that some of the firm's traders had tried to profit from altering rate submissions to yen Libor from 2006 to 2010.
Mr. Ricci's name surfaced in a relation to the inquiry in which some of the firm's senior managers altered Barclays' submissions to the London interbank offered rate, or Libor.
Both companies said they were also lodging a submission to alter the new Draft Development Plan for Dundee.
Concerns that firms were altering their Libor submissions were first brought to the attention of authorities in late 2007, according to regulatory filings.
Last year, the British bank Barclays agreed to a $450 million settlement with authorities after some of its traders were found to have altered Libor rate submissions for financial gain.
Individual links were sent to the parents using the online survey software, Qualtrics, which enabled participants to save and alter their responses prior to submission.
