U.S. stocks open lower as Wal-Mart profit warning spooks investors

U.S. stocks opened lower on Tuesday after Wal-Mart
WMT,
-8.51%
cut its profit outlook and blamed food inflation for forcing American consumers to curtail spending on other items. The S&P 500
SPX,
-1.05%
retreated 16 points, or 0.4%, to 3,951. The Dow Jones Industrial Average
DJIA,
-0.57%
shed 97 points, or 0.3%, to 3,189. The Nasdaq Composite
COMP,
-1.61%
dropped 94 points, or 0.8%, to 11,685. Wal-Mart shares fell 8.3%, or $11, to $121.