By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks dropped and bond yields surged Wednesday after Federal Reserve chairwoman Janet Yellen said that rate hikes could happen about six months after the Fed wraps up bond purchases.

The S&P 500 (SPX) fell 11.48 points, or 0.6%, to 1,860.77, most of the losses coming after the comment from Yellen during the press conference. The Dow Jones Industrial Average (DJI) dropped 114.02 points, or 0.7%, to 16,222.17.

The Nasdaq Composite (RIXF) shed 25.71 points, or 0.68%, to 4,307.60.

The FOMC decided to trim the bond purchases by another $10 billion this month and changed the way it targets unemployment and inflation in deciding short-term interest rates.

Yellen fielded questions from the press following the widely expected Fed policy announcement in her first news conference as the Fed chairwoman, succeeding Ben Bernanke.

Stocks, which were flat before the Fed statement, retreated afterwards. But the hard drop, which took the Dow down more than 200 points, came when a reporter asked Yellen how long the Fed would wait to start raising rates after it stops buying bonds in what's known as quantitative easing.

Yellen said the Fed's language "probably means something on the order of around six months, that type of thing." The taper of the Fed's bond purchases is expected to end in October or November, putting the potential first rate hike on course for April or May of 2015.

Read the recap of our live stock-market coverage.

See also: Recap of live coverage of the Fed decision and the Janet Yellen news conference.

Yields on 10-year Treasurys surged, gold prices fell further and the dollar spiked against the Japanese yen after the Fed announcement and Yellen comments. Traders in fed funds futures moved up their bets on rate hikes by two meetings, to April 2015.

"It was a harsh reminder that QE wouldn't be here forever and it would be done by the fall. Then when she noted that 'considerable time' for keeping the fed funds rate in the current range would be six months after QE ends, this opened the door to higher rates by April. July was the consensus for the first rate hike," said Ryan Detrick, senior technical strategist at Schaeffer's Investment Research.

Earlier, a batch of mixed earnings did little to influence otherwise cautious sentiment.

Among individual stocks, shares of First Solar Inc. (FSLR) jumped 21% to top the S&P 500 index after the company forecast strong earnings and said it is collaborating with GE to develop a more cost-effective photovoltaics power plant design. See also: Movers and shakers.

Shares in KB Home (KBH) jumped 5.9% after the home maker swung to profit in its fiscal first quarter, beating analysts estimates.

Nu Skin Enterprises (NUS) shed 5.8% after it said in a 10-K filing on Tuesday that it expects to be fined and potentially face other sanctions in China following an investigation into its business practices.

Shares of Hewlett-Packard Co. (HPQ) rose 3.5% as the tech giant is scheduled to host a shareholders meeting later Wednesday following the release of interim financial statements.

Cigna Corp. (CI) shares gained 3.3% after steep losses recently. The stock is down over 8% year to date.

Pacific Sunwear of California Inc. (PSUN) shares rose 3.7% after the retailer posted better-than-expected results for the fourth quarter on Tuesday after the bell.

In overseas markets, Asia had a mixed day, with the Nikkei 225 giving up a more than 1.2% gain at one point to close up just 0.4%, while Chinese stocks went nowhere. European markets slipped, while the FTSE 100 index rose after the release of minutes from the latest Bank of England Monetary Policy meeting and the latest jobs data. (GBPUSD)

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