U.S. Planners See Shiite Militias as Rising Threat

From the WaPo, here

"Gen. David H. Petraeus and Ambassador Ryan C. Crocker have concluded that Shiite extremists pose a rising threat to the U.S. effort in Iraq, as the relative influence of Sunni insurgent groups such as al-Qaeda in Iraq has diminished drastically because of ongoing U.S. operations..."