British extremists are among the "most vicious and vociferous fighters" in Islamic State (Isis) ranks in Syria and Iraq, a jihadism expert has said.
Sunni Muslims from the UK are taking part in the conflicts "in every way", according to Shiraz Maher from King's College London's International Centre for the Study of Radicalisation.
That includes acting as suicide bombers and executioners, he told BBC Radio 4's Today programme on Wednesday after a video purporting to show a US journalist being beheaded by an Isis fighter with a British accent was placed online.
The black-clothed and masked man, who spoke with traces of a London accent, threatened bloodshed in the gruesome video, accusing America of plotting against Muslims and interfering in their affairs before taking a knife to his victim's throat. » | Press Association | Wednesday, August 20, 2014
