US share prices have recorded their sharpest fall in four months 2.01 per cent in response to an unexpectedly strong employment report for June.
Prices at one point slumped 120 points amid investor fears of a spurt in inflation.
They were reacting to a US labour department report that the US economy added 239,000 new jobs in June, when the average hourly wage rose nine cents.
Trading curbs, activated to slow computerised dealing whenever the Dow Jones falls by 50 points, were in place 11 minutes after the opening bell.
The New York Stock Exchange closed three hours early amid the absence of many traders following the US Independence Day holiday.