U.S. stocks fell on Thursday as concerns escalated about Iraq and after disappointing economic data on retail sales and jobless claims. The three major U.S. stock indexes ended off their session lows. With the day's decline, though, the S&P 500 was down for three straight sessions for the first time since early April. The Dow Jones industrial average lost more than 100 points for the second day in a row. true Hours after ethnic Kurdish forces took control of the oil hub of Kirkuk after the Shi'ite-led government's troops abandoned their posts, President class="mandelbrot_refrag"> Barack Obama was asked if he might order drone strikes or other action to halt the insurgency that has seized much of northern Iraq this week. Obama told reporters that he refused to rule out U.S. action in Iraq against Sunni Islamist militants who have surged out of the north toward Baghdad, threatening to divide the country and establish their own jihadist state.