"The Islamic State of Iraq later claimed responsibility for the attack through a statement posted on a radical Islamic website. The umbrella group includes a number of Sunni extremist organizations and has ties to al Qaeda in Iraq.
"The Mujahedeens raided a filthy nest of the nests of polytheism, which has been long taken by the Christians of Iraq as a headquarter for a war against the religion of Islam and they were able by the grace of God and His glory to capture those were gathered in and to take full control of all its entrances," the group said on the website."
http://www.cnn.com/2010/WORLD/meast/...ex.html?hpt=T1