hours trading Thursday after it warned that second-quarter revenues will be below Wall Street estimates.
On Thursday, the Dow Jones industrial average gained 31.61 points, or 0.31 percent, to 10,302.29. The Standard & Poor's 500 Index edged up 2.93 points, or 0.25 percent, to 1,197.87. The Nasdaq Composite Index rose 7.01 points, or 0.34 percent, to 2,075.66.
British police scrambled through precarious rail tunnels deep underground on Friday to hunt for clues and retrieve bodies after suspected al Qaeda bombers killed more than 50 people in London rush-hour blasts.
Four bombs tore through three underground trains and a red double-decker bus in attacks that were London's deadliest in peacetime and coincided with a summit of the Group of Eight industrialized countries in Gleneagles, Scotland.