U.S. military spokesman Major General William B. Caldwell said one of those seized was linked to the February 22 bombing of a Shi'ite shrine that triggered the current destructive cycle of sectarian bloodshed.
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SUNNI, SHI'A: Iraq is riven along sectarian lines, faults that frequently produce violent clashes and are a constant source of tension. Sectarian concerns drive much of Iraqi politics and are the main threat to the country's fragile security environment.
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