Cops fear that 25 British-born Muslims are plotting to bomb Western airliners.
The fanatics, in five groups, are now training at secret terror camps in Yemen.
It was there London-educated Umar Abdulmutallab, 23, prepared for his Christmas Day bid to blow up a US jet.
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The British extremists in Yemen are in their early 20s and from Bradford, Luton and Leytonstone, East London.
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