This is absurdly transparent terrorist propaganda. They were going to run these attacks regardless of what happened at Haditha. This is just about PR. Now, it may incite people to join up with the insurgency, and as a recruiting tool, it may have some value. Still, I wouldn't trust an Ansar al Sunnah press release any more than I would one from Kim Jong Il.
That's really my point in posting this. Murtha went on numerous media outlets and was quoted around the world saying that Marines killed civilians in Haditha "in cold blood" and "there's no doubt about it". And he (and the media) attacked anyone who said that he was lending fuel to the terrorist fire.
Still, I wouldn't trust an Ansar al Sunnah press release any more than I would one from Kim Jong Il.
Does that mean you dont believe that Kim has nukes? Ansar al-Sunnah may be taking credit for someone else's attack. Or maybe not. I have no real reason to doubt their story. Do you?