Key U.S. stock indexes opened the day lower, with the S&P 500 and the tech-heavy Nasdaq down 1.2% and 2%, respectively, in the early hours of the session. Gold jumped 1.2% to $2,690 per ounce and neared its record high just above $2,700 set last week, while WTI crude oil surged 3% to $70 per barrel.