An early plunge of 7% on Wall Street triggered a trading halt as a sell-off hitting global markets continued amid the coronavirus outbreak.
The Dow Jones industrials dropped more than 1,600 points, or 7%, and the S&P 500 fell a similar amount.
Trading resumed after 15 minutes.
The rout came after US President Trump imposed a travel ban on most of Europe and offered few new measures to contain the economic impact of the coronavirus outbreak.
Benchmarks in Europe fell more than 7% even after the European Central Bank announced more stimulus measures.
World markets are enduring violent swings amid uncertainty about how badly the outbreak will hit the economy.