British jihadists: how much of a threat do they pose?

As jihadist warns of 'black flag of Islam over Downing St', a Q&A on the risks for the West

Militants brandish their weapons in Iraq
(Image credit: HAIDAR HAMDANI/AFP/Getty Images)

British jihadist Abu Osama has said he will not return to the UK until it is conquered by the Islamic state and he can "raise the black flag of Islam over Downing Street and Buckingham palace", the BBC reports.

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