US stocks traded mostly lower overnight after worse-than-expected unemployment and tame inflation data raised concerns about the strength of the economic recovery.
The Dow Jones Industrial Average fell 14.36 points (0.14 per cent) to 10,395.25 in early trading.
The tech-rich Nasdaq index rose 1.94 points (0.08 per cent) to 2307.87, while the broad-market S&P 500 index dropped 0.59 point (0.05 per cent) to 1114.02.
Wall Street bias was on the upside after a successful Spanish bond auction that eased fears the eurozone country was heading for a Greek-style debt crisis, Briefing.com analysts said.
But the market optimism proved short-lived after official US economic data disappointed.
"The initial verdict wasn't a good one," the Briefing.com analysts said in a note to clients.
New claims for jobless insurance benefits rose for the second straight week, the Labor Department reported, dashing analyst expectations they would fall.
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Claims climbed to 472,000 in the week to June 12, an increase of 12,000 from the previous week's revised figure of 460,000.
In a separate report, the Labor Department said consumer prices fell for the second straight month in May, by 0.2 per cent, due to falling energy prices. The average analyst forecast was a 0.1 per cent decline.
The lacklustre opening came after a nearly flat session yesterday.
The Dow rose 0.05 per cent, the Nasdaq was virtually unchanged and the S&P 500 dipped 0.06 per cent.
US stocks drop on economic data worriesStocks slide on weak jobs report
