Greater Manchester Police are working hard to track down any suspects.
Police in Manchester have reportedly arrested a 23-year-old man in relation to Monday night's attack at the Manchester Arena, which left 22 people dead and 59 injured.
Another man is believed to have died after detonating a device around the foyer of the venue after a concert by the singer Ariana Grande.
Following the naming of teenager Georgina Callander as the first victim of the attack, police confirmed that a man was in custody.
The 23-year-old man was arrested in South Manchester.
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The Queen, meanwhile, has described the attack as 'an act of barbarity'.
"The whole nation has been shocked by the death and injury in Manchester last night of so many people, adults and children, who had just been enjoying a concert," she said in a statement.
"I know I speak for everyone in expressing my deepest sympathy to all who have been affected by this dreadful event and especially to the families and friends of those who have died or were injured.
"I want to thank all the members of the emergency services who have responded with such professionalism and care.
"And I would like to express my admiration for the way the people of Manchester have responded, with humanity and compassion, to this act of barbarity."
