The Dow Jones Industrial Index fell four per cent, or 332 points to 7,949.09, the steepest fall for two months, over fresh concerns about the health of America's banking industry. The huge sell-off hit London where the FTSE 100 opened this morning down 61.38 points at 4030.02. Barclays was the biggest victim, falling 19.7p to 53.2p, knocking just over a quarter off its value. Sterling slid again against the dollar.