Until now, most of the attention has involved traders at Barclays, which last month reached a $453m settlement with U.S. and UK authorities for its role in the manipulation of rates. Now, it is becoming clear that traders from at least two other banks - UK-based Royal Bank of Scotland Group and Switzerland's UBS - played a central role.
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In the meantime, the news agency also reports that the UK Government is expected to spell out on Monday the scope of a root and branch reform of Libor, in a widening scandal that has damaged London's standing as a finance centre.
The UK Treasury is set to announce the remit for a review of the rate at which banks are willing to lend to one other that is being carried out by Martin Wheatley, a top official at the UK's Financial Services Authority regulator.