A British jihadi who has threatened to ‘bomb the UK’ is today unmasked as a former supermarket security guard – who travelled to wage war in Syria despite being known to police. Less than two weeks ago, the anonymous extremist known only as ‘Awlaki’ gave an extraordinary interview to the BBC where he boasted about fighting with the terror group Islamic State (IS) and laughed about the beheading of soldiers. But today The Mail on Sunday can reveal that this fanatical Muslim who claims to ‘hate the UK’ is 27-year-old Omar Hussain, who grew up in High Wycombe, Buckinghamshire. Scroll down for video
@highlight
Omar Hussain travelled to wage war in Syria despite being known to police
@highlight
He had formerly worked as a security guard at Morrisons in High Wycombe
@highlight
The 27-year-old has told friends in UK he watched beheading of James Foley
@highlight
Lord Carlile last night called for investigation into how Hussain left  country
Former classmates from @placeholder comprehensive school in High Wycombe yesterday recalled Hussain as a ‘weird, social outcast’.