Islamic State of Iraq Claims Killing of Safavid Leader, Aides in New Baghdad Islamic State of Iraq Claims Killing of Safavid Leader, Aides in New Baghdad

Centcom: Islamic State of Iraq Claims Killing of Safavid Leader, Aides in New Baghdad makes interesting reading. Apparently this Sunni terrorist group blew up some Shi'a leader and his aides on the highway. The "Safavid" is a reference to Iran. But that could just mean Shi'a, and not just Iranian. This is the core of the announcement:

"God enabled the security forces of The Islamic State of Iraq, "God bless it" to liquidate one of the leading planners of the Al-Dajjal and Magusi [Shiite] army, who was also a leader of one of the biggest Safavid gangs that spread havoc in the Islamic land, with his big black turban on his dirty head and surrounded by numerous body guards.

So, on Monday, 29 Rabi al-Awwal 1428, corresponding to 16 April 2007, with the help of God, and after hiding in dark holes for a long time, he was liquidated along with his entourage while riding in a four-wheel drive vehicle on the express highway of New Baghdad area, near Al-Durah state. Praise and thanks be to God.

Without doing a bit more research, I can't figure out who this group killed.