The suicide bomber who slaughtered 22 at Manchester Arena may have been known to police before carrying out last night’s atrocity, it has emerged.
An urgent police probe is underway this morning to determine whether the attacker acted alone or had accomplices as part of a wider terror cell.
Officers are also combing CCTV to determine whether he carried out a ‘recce’ of the arena before detonating a nail bomb as thousands were leaving the Ariana Grande concert at 10.30pm.
Nobody has claimed responsibility for the explosion. But last night,ISIS supporters were celebrating the massacre online while two messages, posted four hours before the attack, appeared to predict the mass killing.
This morning, police said a 23-year-old man has been arrested outside a supermarket in south Manchester in connection with the arena massacre.
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