They might be investors who lent money to the bank by buying its short-term bonds, with a Libor-linked interest rate.

BBC: Libor scandal: Who might have lost?

Underlying the rate worries, bonds -- whose fixed return makes them linked to interest rate and inflation expectations - also weakened.

BBC: Friday close

Guardian Care Homes accuses the bank of mis-selling it an interest rate hedging product linked to the Libor interest rate which Barclays, and other major international banks based in London, are now known to have manipulated.

BBC: Barclays senior staff 'linked' to Libor affair