U.S. stocks are turning lower in midday trading after giving up an early gain.
The decline puts the Dow Jones industrial average on course for its fourth loss in a row.
As of noon Thursday the Dow was down 64 points, or 0.4 percent, at 16,276.
The Standard & Poor's 500 index fell five points, or 0.3 percent, to 1,862. The Nasdaq composite fell 17 points, or 0.4 percent, to 4,306.
Dollar General fell 2 percent after the company reported that its fourth-quarter earnings took a hit from harsh winter storms.
Amazon rose 2.4 percent after the company raised the price of its popular Prime membership to $99 per year.
Bond prices rose. The yield on the 10-year Treasury note fell to 2.70 percent from 2.73 percent late Wednesday.