.....and shares plunge 17%

Barclays saw its market valuation plunge a breathtaking £4billion today as the global rate-fixing scandal threatened to push chief executive Bob Diamond towards the precipice. Barclays shares collapsed by 17 per cent at one point as investors assessed the damage to Diamond and the brand's reputation inflicted by the interest rate fiddle that earned a £290million fine crashing down on the banking giant last night. Speculation raged over how much board-level executives knew and Prime Minister David Cameron said the bank had 'some serious questions to answer', while Opposition leader Ed Miliband called for a criminal investigation.Mr Diamond waived his annual bonus for 2012 yesterday after the bank was fined by US and UK regulators for boosting its profits by manipulating Libor - the rates at which banks lend to each other, and which form the basis of loans, mortgages and an estimated $360trillion in investments....Read more here: Barclays LIBOR fine: Shares plunge 8% as PM adds to pressure on Bob Diamond