The Dow sank 1%, or nearly 500 points, retreating from morning gains. The S&P 500 suffered a 1.4% loss. The Nasdaq composite was the hardest hit of the major indexes with a 1.9% drop. Small-cap stocks weren't spared the sell-off, with the Russell 2000 index diving 1.6%.

President Donald Trump on Friday voiced frustration with what he called China's "trade hostility," threatening to respond with large tariffs on China and to cancel his upcoming meeting with Chinese Pr...

Elsewhere, gold climbed back above $4,000 a troy ounce, while oil prices tumbled as the government shutdown entered its 10th day.