Trading in all securities were halted on the New York Stock Exchange on Wednesday following earlier reports of technical difficulties, although NYSE-listed issues was still trading on other exchanges.
After the halt, U.S. stocks extended their losses, but in low volumes, with the S&P 500 hitting a session low and the Dow Jones Industrial Average and Nasdaq both falling more than 1 percent.
"It's under control. We're just waiting for word. There's no sign of panic at all," Mark Otto of J. Streicher & Co in New York said from the NYSE floor.
Photos from inside the Stock Exchange today:
"We're waiting to hear word on if there's going to be a reopening, and when it is or any more details."
U.S. markets were in the red even before the halt, which started just after 11:30 a.m. ET, as the slide in Chinese markets spurred concerns over its impact on global economic growth.
Beijing unveiled yet another battery of measures to arrest the sell-off in shares and the securities regulator warned of "panic sentiment" gripping investors in the world's second-largest economy.
Chinese shares have fallen more than 30 percent in the last three weeks, and some investors fear China's turmoil is now a bigger risk than the crisis in Greece.
"With China, investors fear that could be indicative of a broader economic weakness," said Scott Brown, chief economist at Raymond James in St. Petersburg, Florida.
The New York Stock Exchange tweeted the announcement that they aren't under a cyber-attack!!!
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