Market indexes edge lower in midday trade in US, extending losses to 4th day; Oil price gains

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.

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.