By Victor Reklaitis, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks extended their weekly decline on Wednesday, joining in a global sell-off and putting the S&P 500 on pace to stretch its losing streak to three straight sessions.

Analysts attributed the worldwide selling of equities to worries about China's slowdown and continued Russia-Ukraine tensions.

The S&P 500(SPX) was last down 11 points, or 0.6%, to 1,857, leaving the benchmark index 1.1% off its record close on Friday.

The Dow Jones Industrial Average(DJI) lost 77 points, or 0.5%, 16,274, also dropping for the third day in a row.

The Nasdaq Composite(RIXF) fell 27 points, or 0.6%, to 4,280, losing ground for the fifth straight day.

Asian markets closed lower on Wednesday, with Japan's Nikkei benchmark and Hong Kong's Hang Seng shedding 2.6% and 1.7%, respectively. The Stoxx Europe 600 was last down 1.3%, setting that index up for its lowest close in a month.

"Economic slowdown in China and geopolitical tension between Russia and Ukraine are the major hurdles for the markets," said Naeem Aslam, chief market analyst at Ava Trade, in emailed comments on Wednesday.

Beyond China and Russia-Ukraine concerns, reasons for the global slump could include a strengthening euro and fresh questions about Japan's stimulus measures, said Peter Boockvar, chief market analyst at the Lindsey Group, in a note on Wednesday. He said the "2014 global market action in its early stage has a definite different complexion than the easy ride up the chair lift in 2013."

Boockvar noted that many major European and Asian stock markets are at or below their closing lows on March 3, "when markets finally reacted lower to Putin's war games," referring to Russian President Vladimir Putin. Copper, a proxy for global growth, also has slumped, he added.

High-grade copper(HGK4) for May delivery has traded below $3 a pound this week, a level not seen by the metal since July 2010. In addition to fears that a growth slowdown in China could affect copper demand, the metal has also been used as collateral for loan deals and there are fears those could start unwinding.

In economic news on Wednesday, a reading on euro-zone industrial production showed a decline of 0.2%, missing expectations for an increase and contributing to negative sentiment. The U.S. economic calendar is empty, and investors have been looking ahead to next week's Federal Reserve meeting.

Among individual stocks, VeriFone Systems Inc.(PAY) jumped 8%. Late Tuesday, the maker of electronic payment devices reported a fiscal first-quarter loss but it also guided second-quarter revenue above Wall Street's forecasts.

On the downside, Express Inc.(EXPR) shed 12% after the clothing retailer said fourth-quarter earnings fell 25% due to extensive promotions and discounting. (Read more in the Movers & Shakers column http://www.marketwatch.com/story/oxigene-doubles-fannie-and-freddie-extend-fall-2014-03-12.)

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