U.S. stocks are edging lower in midday trading, extending the market's losses to a fourth day.
Losses were bigger in Europe after Saudi Arabia launched strikes on key military installations in Yemen. The price of oil rose.
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The Dow Jones industrial average fell 21 points, or 0.1 percent, to 17,696 as of 11:45 a.m. Eastern time.
The Standard & Poor's 500 fell two points, or 0.1 percent, to 2,058. The Nasdaq composite lost 14 points, or 0.3 percent, to 4,861.
The price of oil rose $1.30 to $50.51 a barrel in New York.
SanDisk dropped 17 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 rose to 1.97 percent from 1.93 percent.