The US treasury is working on plans to inject up to $15bn (£7.5bn) of capital into Fannie Mae and Freddie Mac to stem the crisis at America’s biggest mortgage firms.

The two companies lost almost half their market value last week as rumours of a government bail-out swept the stock markets, hammering share prices around the world.

Together, the two stockholder-owned, government-sponsored companies own or guarantee almost half of America’s $12 trillion home-loan market and are vital to the functioning of the housing market.

The capital-injection plan is said to be high on a list of options being considered by regulators as a means of restoring confidence in the lenders. The move would protect the American housing market, but punish shareholders in both companies.

Sunday Times, Financial Times, Daily Telegraph