Global regulators want rates to be based on observable transactions.

Misconduct deemed 'more serious than Barclays'; damning e-mails released.

Fines from U.S. and U.K. regulators may be announced as soon as next week.

Fines from U.S. and U.K. regulators may be announced as soon as next week.

Former Citigroup trader among those arrested.

Bank said to pay more than $465 mln to settle allegations.

Bank said to pay more than $465 mln to settle allegations.

U.K.'s Serious Fraud Office won't confirm, but notes "significant developments" in case.