By Kate Gibson, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks fell on Wednesday, extending losses into a third session, as Wall Street worried about the timing of cuts in the Federal Reserve's $85 billion in monthly bond purchases.

The market's retreat is "attributable to comments made yesterday by [Fed Bank of Chicago President] Charles Evans regarding the possibility of tapering beginning in September. There's a certain contingent in the market that doesn't want to see quantitative easing end, and thinks QE is the primary pillar that the market is resting on," said Matthew Kaufler, portfolio manager at Federated Investors.

The S&P 500 index declined 0.6% on Tuesday after Evans said the central bank could start easing its asset buys as soon as September.

"I personally would be very pleased once tapering begins and hopefully continues to its proper conclusion. As a largely capitalistic society, we want our institutions to stand on their own two feet, so the quicker we can get back to that, the better off we'll be," Kaufler added.

The market is overbought after a six-week run higher, but much of the fretting over the Fed's monetary moves is already priced in, which is "why this decline shouldn't carry that far," said Bruce Bittles, chief investment strategist at R.W. Baird & Co.

And while Bittles concurred with the view that equities are reacting to the idea of Fed "tapering in September," he does not think the central bank will reduce stimulus this year, given the still weak labor market.

"Most of the jobs created this year are part-time, that's why I say I think the economy is still suspect," he said. Read another view from Goldman Sachs on September tapering.

Off session lows that had it down 97 points, the Dow Jones Industrial Average (DJI) was more recently off 56.39 points, or 0.4%, at 15,462.15, with shares of Bank of America Corp. (BAC) pacing blue chip declines that included two thirds of its 30 components. Its shares fell 2%, a day after the Department of Justice filed suit against the bank for allegedly misleading investors about loans linked to mortgage-backed securities.

Also weighing on the Dow, Walt Disney Co. (DIS) declined 1.7% after the entertainment company reported fiscal third-quarter profit little changed from the year-ago period.

The S&P 500 index (SPX) shed 7.01 points, or 0.4%, to 1,690.36, with financials falling hardest among its sectors.

"We've enjoyed a strong seasonal tailwind the last few months that's going to turn into a headwind in what is typically a weak season for stocks. Plus, corporate earnings for the second quarter were basically flat," said Bittles.

The Nasdaq Composite (RIXF) declined 15.38 points, or 0.4%, to 3,650.36.

For every share gaining, more than two fell on the New York Stock Exchange, where 315 million shares traded by 1:45 p.m. Eastern. Composite volume exceeded 1.8 billion.

The dollar (DXY) edged lower against the currencies of major U.S. trading partners including the yen (USDJPY), while Treasury prices rose, lowering the yield on the 10-year note by 5 basis points to 2.599%.

Oil prices slipped, with the September crude futures (CLU3) contract down $1.03, or 1%, at $104.27 a barrel on the New York Mercantile Exchange.

Gold futures turned higher, with the futures contract for December delivery (GCZ3) up $2.90, or 0.3%, to $1,285.40 an ounce on the Comex.

First Solar Inc. (FSLR) fell almost 14% after the solar-panel manufacturer reported a profit drop in the second quarter.

Zillow Inc.'s (ZILLOW.XX) shares dropped 7.4% after the real-estate information site reported a second-quarter loss. Read Wednesday's Movers & Shakers.

Time Warner Inc. (TWX) climbed 1.5% after the entertainment provider reported larger-than-expected quarterly revenue.

AOL Inc. (AOL) shares gained 1.7% after the Internet company reported better-than-expected revenue for the second quarter and said it would buy Adap.tv, a video advertising platform, for $405 million.

Ralph Lauren Corp. (RL) declined 6.5% after the clothing retailer projected quarterly profit beneath estimates. (Read more in Behind the Storefront: http://blogs.marketwatch.com/behindthestorefront/2013/08/07/ralph-lauren-results-shock-spoiled-investors/.)

Computer Sciences Corp. (CSC) rose 6.9% a day after the technology consultant hiked its earnings outlook.

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