US stocks' losses have accelerated in afternoon trading, pushing the S&P 500 down more than 5 per cent from its January 26 record high and the Dow below 25,000 for the first time since January 4.

US stocks' losses have accelerated in afternoon trading, pushing the S&P 500 down more than 5 per cent from its January 26 record high and the Dow below 25,000 for the first time since January 4.