Five minutes into trade the Dow Jones Industrial Average was down 31.06 points (0.22 percent) at 13,961.91.

The S&P 500 index fell 2.01 (0.13 percent) to 1,515.92, while the tech-rich Nasdaq Composite Index lost 2.87 (0.09 percent) at 3,191.00.

Google shares fell 0.8 percent to $779.30 after the company revealed on Friday that Chairman Eric Schmidt plans to sell 3.2 million of his "A" shares in the company, currently worth $2.5 billion, over the next year.