A jihadist who plotted a lone-wolf knife attack has been jailed for life after a judge said he ought to have turned his back on extremism when two of his brothers were killed fighting for Islamic State in Syria. Sahayb Abu, an aspiring rapper, bought an 18-inch sword, a knife and combat clothing as he prepared to strike last summer. The 27-year-old, who is the fifth member of his family to be linked to extremism, also used a rap song to boast about wanting to behead British soldiers. Abu’s half-brothers, Wail and Suleyman Aweys, were killed in Syria after leaving the UK to fight for Islamic State of Iraq and the Levant (IS). His half-sister, Asma Aweys, 32, was jailed in January 2019, alongside her partner Abdulaziz Abu Munye, 29, and half brother Ahmed Aweys, 34, after she called Ariana Grande 'the devil' in the wake of the Manchester Arena attack in a family WhatsApp chat. Asma was imprisoned for 19 months for collecting terrorist information, while her partner received 15 months for dissemination. Ahmed was jailed for 25 months for also disseminating terrorist material. Last month an Old Bailey jury found Abu guilty of preparing to engage in terrorist acts and on Tuesday he was jailed for life and told he would have to spend a minimum of 19-years behind bars.