British jihadist fighting for Isis in Syria sends chilling picture of bombs he is learning to make and warns UK to be 'afraid'

                                                                                                                                                                                                                      Nasser Muthana, 20, from Cardiff, posted a terrifying gallery of improvised explosive devices (IEDs) and also other weapons he hoped he could use to decapitate enemies. Below one he added the stark warning: 'So the UK is afraid I come back with the skills I've gained.' It came as his younger brother Aseel, 17, vowed to fight to the death for Isis and claimed 'jihad is obligatory' for Muslims.