is this ISIS's weirdest Western jihadi? The dorky Australian 17-year-old who vows to fly Islamist flag over Buckingham Palace and calls himself Abu Khaled (but his family call him 'idiot')

Ginger-haired Australian jihadist Abdullah Elmir, 17, has been condemned by his relatives over a chilling video in which he declares ISIS will not stop their murderous campaign 'until the black flag is flying high in every single land'. In a propaganda video for the terror group published on YouTube, the young white, Sydney-born man calling himself Abu Khaled from Australia is flanked by other ISIS fighters. The jihadist goes on to claim that ISIS are going to put a 'black flag on top of Buckingham Palace' and the White House. Elmir reportedly told his mother he was 'going fishing' when he disappeared from his home in Bankstown, west Sydney, in June.