Federal Reserve Chairman Ben Bernanke has testified the central bank had no option but to let Lehman Brothers fail despite knowing it would have "catastrophic" aftershocks.
Former Lehman Brothers CEO Dick Fuld believes the investment bank may have been able to survive if US authorities had given it the same assistance as its rivals.
More than a tenth of the 7,380 banks in the US remain at risk of failure despite the sector posting strong profit growth during the second quarter.
The Federal Reserve is prepared to take "unconventional measures" to prop up the US economic recovery, said Ben Bernanke in a speech today.
Worse-than-expected economic data from the US last week reignited fears of a double-dip recession, but managers are cautiously optimistic the economy will remain supportive of global growth.
The FTSE 100 has slid more than 2% lower this afternoon after US markets suffered even sharper losses in early Wednesday trading.
European markets are in retreat this morning on fresh fears for global growth sparked by a gloomy outlook from the US Federal Reserve.