[A]l Qaeda in Iraq is shifting its tactics. He said al Qaeda previously launched bombings targeting the civilian population in an effort to restart sectarian violence, but it didn't work.
"Iraqis simply refused to be provoked into that kind of widespread carnage that we saw in '06 and '07," he said. "So al Qaeda shifted to take on the (Iraqi) state, and I don't think that's going to work either."
Al Qaeda in Iraq 'shifting its tactics' - CNN.com