By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks reversed opening gains on Thursday as fears over the escalation of conflict between Ukraine and Russia as well as slowdown in China outweighed upbeat domestic economic data.

Stocks opened higher after a pair of upbeat economic reports, which showed a surprise drop in a number of people claiming unemployment benefits and an uptick in retail sales in February, but indexes gave up gains less than hour into trading and sold off by afternoon.

The S&P 500 (SPX) was down 12 points, or 0.7% at 1,855.65, pulling away from its previous closing high. Technology and energy sector stocks were leading losses on the benchmark index.

The Dow Jones Industrial Average (DJI) dropped 122 points, or 0.8%, to 16,218.91, with 27 of 30 stocks trading lower. Pfizer Inc and American Express Co were leading losses.

The Nasdaq Composite (RIXF) lost 39 points, or 0.9%, to 4,284.34.

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Giving a boost to stocks earlier was a pair of reports pointing to the strengthening economy. A surprise drop in weekly jobless claims and a rise in retail sales provided support to stocks. The number of people who applied for U.S. unemployment benefits in the first week of March fell to the lowest level in more than three months, perhaps a sign of an uptick in labor-market conditions.

Sales at U.S. retailers rose in February for the first time in three months as shoppers boosted purchases of a variety of goods after being cooped up by one of the harshest winters in years.

But investors turned all their attention to the Fed policy-setting meeting next week while keeping a weary eye on Crimea's vote this weekend to decide wether to stay with Ukraine or join Russia. The FOMC policy setting meeting is scheduled for March 18-19 and Fed Chairwoman Janet Yellen will give her first press conference in her new role. Read also: Stock investors look past jobs to Yellen, Ukraine

China slowing; Copper drops

Asian markets were mixed, with the Nikkei 225 index ending slightly lower, and the Hang Seng Index falling 0.7% after data showed China's industrial production slowed in the January-February period, while retail sales in January eased.

The Shanghai Composite rose 1%. Some attributed this to comments by Chinese Premier Li Keqiang, who said he was confident the Chinese economy would meet its 7.5% growth goal for this year.

European stocks sold off in late session.

Gold (GCJ4) shifted moderately lower, but copper prices (HGK4), under pressure this week due to China worries, were off another 3.3%.

The dollar strengthened against other currencies after better-than-expected retail sales and jobless numbers. 10-year Treasury yields ticked up.

Amazon rallies; Herbalife slumps

Shares in Amazon.com Inc (AMZN) rose 1.3% after the online retailer said it would raise the annual price for its Prime membership to $99 from $79.

Williams-Sonoma Inc. (WSM) jumped 10% after the retailer topped forecasts with its quarterly earnings and revenue, as well as announcing a hike in its dividend late Wednesday.

Plug Power(PLUGD) rose more than 10% after the fuel-cell company topped a sales forecast in results on Thursday.

Herbalife Ltd. (HLF) fell 3.3% after the company announced an investigation by regulators on Wednesday, a day after hedge-fund manager accused it of violating Chinese regulation.

Dollar General Corp. (DG) shares fell 3.2% after posting a sales rise, but an outlook that fell short of expectations.

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