ibn Emwazi pleaded guilty to possession of stolen bicycles in 2012 . Brother Mohammed - laden was - acquitted of same charge weeks before . Omar revealed as leader of street preaching group called Power of Dawah . Group supports fundamentalist preacher Abdur Raheem Green . Green previously linked to al - Qaeda 's book ' holy 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 '