Wall Street market report
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(Open): US stocks opened slightly higher as hopes of an easing in the Ukraine crisis offset news of US air strikes in Iraq.
The tech-heavy Nasdaq index opened higher but then fell back to stand 2.31 points lower at 4,332.66.
Zynga shares fell 2.2% after the online games maker cut its outlook for 2014.
The company - whose games include Farmville - said 2014 bookings would be between $695m-$725m, compared with an earlier forecast of $770m-$810m.
Shares in McDonald's were down 0.2% after it said this year's global sales forecast was "at risk" after a food scare in China forced it to withdraw some products temporarily.