Stocks are closing lower after recouping some of an afternoon swoon.
Several companies fell Thursday after releasing weak results. Harman International, Varian Medical Systems and Yelp all sank.
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The Dow Jones industrial average lost 195 points, or 1.1 percent, to 17,840. It was down as much as 260.
The Standard & Poor's 500 index declined 21 points, or 1 percent, to 2,085. The Nasdaq fell 82 points, or 1.6 percent, to 4,941.
Technology and health care companies fell the most.
Oil rose nearly 2 percent and finished April with a gain of 20 percent. U.S. oil gained $1.05 to $59.63 a barrel.
Bond prices didn't move much. The yield on the 10-year Treasury note held steady at 2.04 percent.