Iraqi police said four British personnel were killed when the helicopter was brought down, apparently by a missile.
Britain's Defense Ministry has acknowledged "casualties" in the crash, but declined to give a precise figure or discuss the cause of the downing.
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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.