Ten of America's largest 19 banks need a combined $74.6bn (£50bn) of extra funds to boost their cash reserves.

That is the main finding of the so-called "stress tests" to see if the banks have sufficient capital to cope should the recession worsen.

Bank of America is the most at risk, needing an additional $33.9bn.

"Our hope with today's actions is that banks are going to be able to get back to the business of banking," said US Treasury Secretary Timothy Geithner.

Other banks that need more money include Wells Fargo, which is said to require $13.7bn, and GMAC, the financial arm of General Motors, which needs $11.5bn.

Citigroup requires an additional $5.5bn of funds, and Morgan Stanley has been told to find $1.8bn.

'No surprises'

The 19 banks that were tested by Treasury Department and Federal Reserve officials account for two-thirds of the total assets of the US banking system, and more than half of the total amount of credit in the US economy.

http://news.bbc.co.uk/2/hi/business/8039096.stm