Omar Emwazi pleaded guilty to possession of stolen bicycles in 2012 . The British jihadist was sentenced to life imprisonment for his role in the 2013 attacks on London and Manchester that killed 52 people. Omar revealed as part of street preaching group called Power of Dawah . Group supports fundamentalist preacher Abdur Raheem Green . Green previously linked to al-Qaeda 's failed 'Underpants Bomber '
Omar Emwazi pleaded guilty to possession of stolen bicycles in 2012 . Brother Mohammed - Jihadi John - acquitted of same charge weeks before . Omar revealed as part of street preaching group called Power of Dawah . Group supports fundamentalist preacher Abdur Raheem Green . Green previously linked to al-Qaeda 's failed 'Underpants Bomber '