(Bloomberg) -- JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon called on employees to be vigilant about their language in e-mails and instant messages amid growing regulatory scrutiny of traders’ written communications, said two people with knowledge of his comments.

“Don’t exaggerate, don’t ruminate, don’t bullshit,” Dimon, 57, told employees at a town hall meeting at the bank’s office in London’s Canary Wharf last week, according to an attendee who asked not to be identified because they weren’t authorized to speak publicly. “I’m serious,” said Dimon.

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