US stocks have tumbled, with the S&P 500 and the Dow marking their biggest daily declines since February 8 and technology stocks were at the centre of the carnage as rising US Treasury yields sent investors fleeing from risky assets.

US stocks have tumbled, with the S&P 500 and the Dow marking their biggest daily declines since February 8 and technology stocks were at the centre of the carnage as rising US Treasury yields sent investors fleeing from risky assets.