This March 23, 2008 photo provided by the Hennepin County, Minn. Sheriff's Office shows Douglas McAuthur McCain. The Obama administration has offered a wide range of assessments of the threat to U.S. national security posed by Islamic State extremists in an area straddling eastern Syrian and northern and western Iraq, and whose actions include last week’s beheading of American journalist James Foley. Some officials say the group is more dangerous than al-Qaida. Yet intelligence assessments say it currently couldn’t pull off a complex, 9-11-style attack on the U.S. or Europe. (AP Photo/Hennepin County, Minn. Sheriff's Office)
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