Stocks closed at a low point Tuesday, with the Dow and S&P logging their biggest declines since June, after two Federal Reserve presidents said the Fed could begin tapering its easy-money program as early as September.
"This week has been pretty slow so far, but whenever that word 'taper' is put out there, it scares the market," said Joe Bell, senior equities analyst with Schaeffer's Investment Research.
(Read more: Wien: Government should spend more and taper less)
The Dow Jones Industrial Average was 104 points lower in early afternoon trading, dragged by IBM and Caterpillar, a day after logging its worst one-day drop in more than a month.
All key S&P sectors tradThe Dow Jones Industrial Average tumbled nearly 100 points, dragged by IBM and Hewlett-Packard.
All key S&P sectors closed in the red, led by materials and financials.
"You stay away from a dull market [because] there's very little money to be made," said Art Cashin, director of floor operations at UBS Financial Services. "You look for opportunity or news changes, so you need some volatility to inspire a little extra volume."
Atlanta Fed president Dennis Lockhart said the initial taper in the central bank's asset purchase program could start at any of the three remaining Federal Open Market Committee meetings this year.
Lockhart added he was not disappointed by the July unemployment report and said he'll be watching data closely for "the next few weeks" to see if the economy is on track for faster growth.
Chicago Fed President Charles Evans also echoed Lockhart's earlier comments, saying the central bank will likely reduce its stimulus program later this year. Evans is typically among the most dovish policymakers.
(Read more: Fed outlier! No taper before year-end: Strategist)
Among earnings, Michael Kors spiked higher after the luxury retailer posted earnings that nearly doubled, thanks to gains in Europe and roll-out of shops within department stores.
Fossil surged after the fashion accessory maker posted better-than-expected earnings and lifted its full-year outlook.
Meanwhile, American Eagle Outfitters tumbled after the teen apparel retailer said its second-quarter profit will likely be less than half of what Wall Street was expecting, citing weak sales and lower margins. Rivals Abercrombie & Fitch and Aeropostale also declined.
So far, nearly 85 percent of S&P 500 companies have reported results this quarter, with 67 percent of companies topping earnings expectations and 55 percent beating revenue forecasts, according to the latest data from Thomson Reuters. If all remaining companies report earnings in line with estimates, earnings will be up 4.3 percent from last year's second quarter.
Bank of America traded lower after the U.S. Justice Department said it had filed a civil lawsuit against the financial giant for what government lawyers said was a fraud on investors involving $850 million of residential mortgage-backed securities.
IBM slipped after Credit Suisse downgraded the tech giant to "underperform" from "neutral" and cut its price target on the Dow component to $175 from $200, saying organic growth would be challenging in the future.
On the economic front, the U.S. trade deficit fell 22.4 percent to $34.2 billion in June, narrowing to its lowest level in more than 3-1/2 years, according to the Commerce Department. Economists polled by Reuters had expected the trade deficit to narrow to $43.5 billion.
In Europe, shares were slightly higher following reports that showed German industry orders beat forecasts in June to record their biggest rise since October and British manufacturing grew much more strongly than expected.
Meanwhile Japan's benchmark index reversing earlier losses to rally 1 percent as the yen weakened, while the rest of Asian stocks were mixed in choppy trade.
Australia's benchmark index was little changed after the Reserve Bank of Australia cut interest rates by 25 basis points to a record low of 2.5 percent, as widely expected. It marks the eighth rate cut since November 2011 when the central bank first acknowledged a growth slowdown as the country's decade-long mining boom began to fade.
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