Wall Street dips as oil retreats, Wal-Mart weighs

Wall Street was lower on Thursday, snapping a three-day rally, after a slump in Wal-Mart weighed on retail stocks and oil prices retreated. Crude oil prices, whose performance have often dictated stock movements, dropped from session highs after a report showed U.S. crude stocks rose last week. Wal-Mart slumped 4 percent to $63.46 after the retailer reported a lower quarterly profit and gave a lackluster sales outlook.