Wall Street moved lower overnight from record highs, while oil prices and the US dollar firmed amid talk about fresh efforts to curb a global glut and increased bets that the Federal Reserve will raise interest rates this year after all.
In 3.11pm trading in New York, the Dow Jones Industrial Average fell 0.2 per cent, while the Nasdaq Composite Index declined 0.3 per cent. In 2.56pm trading, the Standard & Poor's 500 Index slipped 0.2 per cent.
The Dow fell as declines in shares of Merck and those of Pfizer, recently down 2 per cent and 1.7 per cent respectively, outweighed gains in shares of Exxon Mobil and those of Caterpillar, last up 1.1 per cent and 0.7 per cent respectively.
Shares of Wal-Mart fell, last 0.5 per cent weaker in New York, after the world's biggest retailer said it agreed to buy Jet.com for about US$3.3 billion.
"Wal-Mart has definitely put its stake in the ground saying, 'We're going to be winning in e-commerce," Joseph Feldman, an analyst at Telsey Advisory Group, told Bloomberg. "Amazon should be concerned about what Wal-Mart is doing."