Reports of fighting between al Qaeda in Iraq and Sunni militants surfaced Tuesday, the latest hints of rising tensions between the two allied groups.Other reports have emerged this year of tensions between Sunni fighters and the Sunni-dominated al Qaeda in Iraq, particularly from Anbar province, long a favored turf for indigenous Sunni insurgents and foreign fighters infiltrating Iraq from Syria.

This story is interesting in light of PNW's assertion that experts think this is a non event. Of course, giving up Zarqawi was perhaps the start of a trend that may be growing now. Unfortunately, it won't matter without reciprocal sacrifices on the part of the Shia.

Is al Qaeda in Iraq fighting a Sunni backlash? - CNN.com