Al Qaeda in Iraq claimed responsibility Friday for the assassination of a Sunni sheik who had united with U.S. forces to fight the terrorist group in Anbar province.
"Your brothers in the security ministry of the Islamic State of Iraq have assassinated the imam of the infidels and of the apostasy, Abdul Sattar Abu Reesha, one of the dogs carrying Bush's flag," a message posted on an Islamist Web site says.
CNN could not confirm the authenticity of the statement. Al Qaeda in Iraq calls itself the Islamic State of Iraq. 
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CNN's Jamie McIntyre and Barbara Starr contributed to this report.
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