U.S. stocks are closing lower after a see-saw day, extending the market's losses to a fourth day.
European and Asian markets also fell Thursday after Saudi Arabia launched strikes on military installations in Yemen. The price of oil rose.
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The Dow Jones industrial average gave up 40 points, or 0.2 percent, to 17,678.
The Standard & Poor's 500 lost four points, or 0.2 percent, to 2,056. The Nasdaq composite lost 13 points, or 0.3 percent, to 4,863.
The price of oil rose $2.22 to $51.43 a barrel in New York.
SanDisk plunged 18 percent, the most in the S&P 500, after the maker of flash memory chips cut its revenue forecast.
Bond prices fell. The yield on the 10-year Treasury note rose to an even 2 percent from 1.93 percent.