By Anora Mahmudova and Victor Reklaitis, MarketWatch

Twitter jumps

NEW YORK (MarketWatch)--U.S. stocks pared losses on Wednesday afternoon, with the S&P 500 turning positive, as the Federal Reserve appeared to soothe fears that it might start raising interest rates sooner than anticipated.

The S&P 500 (SPX) was up 3 points, or 0.2%, at 1,973, while the Dow Jones Industrial Average (DJI) lost 9 points, or 0.1% to 16,903, but traded well off its session low.

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In a statement at 2 p.m. Eastern, the Fed on Wednesday said the economy is improving but emphasized that significant slack remains in the labor market. The central bank gave no hint of timing of the first rate hike and repeated that it expects the lift off to come a "considerable time" after the end of its bond-buying program.

Earlier Wednesday, the S&P 500 and Dow gave up early gains and turned negative.

A second-quarter GDP report showed the economy "really bounced back nicely," said Peter Cardillo, chief market economist at Rockwell Global Capital, in a phone interview. But Cardillo noted the GDP report also featured a higher inflation reading, and that could have sparked selling on worries that the Fed statement at 2 p.m. would be hawkish.

Meanwhile, tech stocks were shining amid a buying frenzy in Twitter Inc. (TWTR) after the social media network's results blew past forecasts. The Nasdaq Composite (RIXF) rose 25 points, or 0.6%, to 4,468.

Separately, the 218,000 jobs added by the private sector in July fell short of Wall Street expectations. Still, it was the fourth straight month in which that part of the economy has added more than 200,000 jobs.

Twitter rules

Shares of Twitter leapt 22% as analysts moved up price targets in the wake of blowout results.

Humana(HUM) shares fell 5% after the health care insurer's profit came in slightly short of expectations, but sales beat forecasts.

Sprint (S) dropped 2% after the mobile-phone company swung to a profit in the second quarter, as the pace of subscriber losses slowed.

Amgen(AMGN) shares rose 6% after the company posted a 23% rise in earnings, and announced a 15% cut in its workforce as part of a restructuring program late Tuesday. (Read more about the day's notable movers here: http://www.marketwatch.com/story/twitter-amex-yelp-among-stocks-to-watch-2014-07-29.)

Spain stocks rise, Russian blue-chip index surges

European stocks closed mostly lower, while Hong Kong stocks rose for a seventh straight session.

The Russia MICEX index of blue-chips surged more than 2% on Wednesday, which one analyst said is because the new sanctions don't affect the country's key gas sector. Some strategists maintain, though, that Russia stocks remain a tricky bet in wake of those sanctions.

In other markets, crude oil (CLU4) and gold (GCQ4) both lost ground.

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