Quiet college dropout turned bomber: Who was Salman Abedi?

He was quiet and withdrawn, a college dropout who liked soccer — and, some say, showed alarming signs of being radicalized years before he walked into a pop concert at Britain's Manchester Arena and detonated a powerful bomb, killing himself and 22 others.While some claim Salman Abedi had been banned from the mosque he attended for statements glorifying terrorism and his angry rhetoric even prompted an acquaintance to report him to the authorities, others deny that account, saying he never