U.S. stock futures dipped lower and major global markets also moved into the red.
Payroll-processor ADP said the private sector added 135,000 jobs in May. The figure was lower than expected, which may keep investors on edge since the ADP report is typically considered a prelude to the U.S. government's closely watched monthly jobs report. That report is due before the bell Friday.
"It is not that the ADP report is particularly accurate on a month-to-month basis, but it does appear to steal some of the thunder of the U.S. non-farm payroll report," said Marc Chandler, strategist for Brown Brothers Harriman, in a client note. This month's jobs report is "particularly important," he said, given all the rumblings about the Fed's next move.
On the economic docket: At 2 p.m. ET, the Federal Reserve will release its Beige Book report, an analysis of regional economic activity.
Labor costs fell more than 4% during the first quarter, according to government figures, while productivity edged up slightly.
Economic data was also released in Europe. A second estimate of first quarter GDP confirmed that the eurozone economy contracted by 0.2%.
Early movers: Apple (Fortune 500) shares slipped in premarket trading after , the International Trade Commission ruled that several older Apple products violate a Samsung patent and can't be sold within the United States.
Shares of Toyota ( fell more than 2% after the automaker )recalled nearly a quarter million hybrids to fix brakes.
Investors were unimpressed by Japanese Prime Minister Shinzo Abe's unveiling of new "Abenomics" growth policies, leading the Nikkei index to tumble by nearly 4%. Hong Kong's Hang Seng lost 1% and the Shanghai Composite Index declined by 0.4%.
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