The stock market fell to its lowest point since May as traders worried that tensions between Russia and Ukraine could flare up.
Energy stocks were among the biggest decliners. Halliburton and Devon Energy each fell 3 percent.
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The Dow Jones industrial average lost 139 points, or 0.8 percent, to close at 16,429 Tuesday. It was down almost 200 points in early afternoon trading.
The Standard & Poor's 500 index fell 18 points, or 1 percent, to 1,920. The Nasdaq composite lost 31 points, or 0.7 percent, to 4,352.
Target fell 4 percent after the company lowered its second-quarter earnings forecast, citing discounts it had to use to attract shoppers.
Bond prices were little changed. The yield on the 10-year Treasury note held steady at 2.48 percent.