<sod >â MI5 has faced questions over the fact that Abedi was on their radar but slipped through the net in order to carry out the attack that killed 20 people and seriously injured< eod>< sod > â MI5 has faced questions over the fact that Abedi was onÂ its radar but slipped through the net in order to carry out the attack that killed 22 people and several others around 40  seriously injured< eod>