Manchester bomber, Salman Abedi was first actively investigated in January 2014. He was thought to be acting suspiciously with another person who was a 'subject of interest' for MI5. It transpired that this person wasn't Salman Abedi. Six months later, MI5 closed its file on him.

— Dr. Rizwaan Sabir (@RizwaanSabir) December 5, 2017