Details surrounding the weekend bust of 14 suspected Islamist extremists in Barcelona are giving European security forces reason for concern - even beyond the evidence suggesting the group was working toward an eventual terror strike. Whereas radicals of North African origin have long been the main jihadist threat in Europe, Spanish authorities say 12 of the 14 men arrested Saturday are Pakistani. The reason that's so troubling, counterterrorism officials believe, comes with the considerable risk of two different arching lines eventually crossing: the fast-growing size of Pakistani communities on the continent, and their close ties to a homeland where Islamist radicalism is rampant.

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