Equities fell on both sides of the Atlantic as concern about the potential impact of intensifying tensions in Ukraine and Gaza overshadowed US second-quarter earnings.
In late afternoon trading in New York, the Dow Jones Industrial Average fell 0.23 per cent, the Standard & Poor's 500 index retreated 0.22 per cent, while the Nasdaq Composite Index slipped 0.12 per cent.
Declines in shares of General Electric and McDonald's, down 1.9 per cent and 1.3 per cent respectively, outweighed gains in shares of Intel and Microsoft, up 1 per cent and 0.9 per cent respectively.
Shares of McDonald's as well as those of Yum! Brands dropped amid another health food scare at one their suppliers in China. Shares of Yum! Brands were last down 3.8 per cent.
"I think this is going to be really challenging for both these firms," Benjamin Cavender, Shanghai-based principal at China Market Research Group, told Reuters. "I don't know that this is something an apology can fix so easily, because at this point people don't have a whole lot of trust that they have good systems in place."