Fears that unco-ordinated financial regulation could undermine the fragile economic recovery sparked a crisis of confidence among investors.
US, European and Asian stocks tumbled, while some eurozone government bond markets seized, prompted in part by unilateral moves by Germany to ban naked short selling and the politicised debate over the US financial regulation bill.
A worse-than-expected report on weekly US jobless claims and Greek protests over wage cuts also sent investors scurrying for safety, away from the euro and into US Treasuries, German bonds and UK gilts.
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