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New York - U.S. stocks tumbled on Thursday, with the Standard & Poor's 500 suffering its worst session since November 2011, hit by fear that the Federal Reserve will scale back its bond purchases later this year.
Asian and European stocks, along with gold, oil and Treasury bonds, also posted steep declines.
The Dow Jones industrial average ended down 353.87 points, or 2.3 percent, to 14,758.32, with all of its 30 components in negative territory.
Walt Disney Co. and Intel Corp. led the Dow lower, dropping 3.7 percent and 3.3 percent, respectively.
The S&P 500 index dropped 40.74 points, or 2.5 percent, to 1,588.19, marking its biggest decline since November 2011.
The Nasdaq composite lost 78.57 points, or 2.3 percent, to 3,364.63.
Gold futures dropped $87.80 an ounce to close at $1,286.20 on the New York Mercantile Exchange.
Federal Reserve Chairman Ben Bernanke said on Wednesday that the central bank may begin to scale back its $85-billion-a-month bond-buying program, called quantitative easing, later this year if the economy continues to show strength.
The Fed's stance led to sharp losses for U.S. stocks on Wednesday, while the 10-year Treasury yield soared.
On Thursday, the 10-year yield climbed above 2.4 percent.
"If you're that momentum investor looking for a quick trade, you didn't get the information you were hoping for," said Kim Forrest, senior equity analyst at Fort Pitt Capital Group. She said the market is "acting rationally" and selling off about as much as she expected given the Fed "really did disclose that it's not going to be 'QE Eternity.' "
The stock market's big advance since 2009 has in part been fueled by Fed policies that have punished other asset classes and encouraged investment via equities. But at the same time, the end of such policies also should be cause for some celebration among stock investors, according to some analysts.
Fort Pitt's Forrest said that she's a value investor looking for mispriced yet attractive stocks to hold for at least three years, and therefore she and her colleagues aren't selling. "When the market swoons like this, it's a buying opportunity," she said. Investors should be looking for entry points, although not necessarily today, she said.
Other strategists are cautious.
"Near term, it is recommended investors wait for sentiment to turn extremely pessimistic before new buying," said Bruce Bittles, chief investment strategist at R.W. Baird, in emailed comments.
The Dow notched its eight straight triple-digit move, nearing a record set in 2008, when there were 10 swings of that magnitude. It's also trading below its 50-day moving average, and closing below that key stock chart level for the first time since December.
Wednesday's post-Fed rout extended to global markets, with the Hang Seng Index and the Shanghai Composite Index each tumbling close to 3 percent on Thursday. Fed worries were piled on top of a Chinese purchasing managers' index that hit a nine-month low, according to preliminary HSBC data.