Manchester Arena bombing inquiry hears security were warned about suicide attacker

Manchester Arena bomber Salman Abedi was challenged by a member of the public shortly before he detonated the bomb that killed 22 people at an Ariana Grande concert three years ago.
The details of the confrontation emerged as a public inquiry into the atrocity began in Manchester.
The concertgoer, who can be named only as witness A, said he approached a man resembling Salman Abedi because he looked "out of place" on the night of the 22 May 2017 attack.
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