<P> The Manchester Arena bombing was an Islamist terror attack in Manchester, United Kingdom . On 22 May 2017 a shrapnel - laden homemade bomb was detonated as people were leaving Manchester Arena following a concert by the American singer Ariana Grande . Twenty - three people were killed, including the attacker, and over 500 were injured . </P> <P> After initial suspicions of a terrorist network, police later said they believed the bomber, Salman Ramadan Abedi, had largely acted alone but that others had been aware of his plans . </P> <P> On 22 May 2017 at 22: 31 BST (UTC + 01: 00), a suicide bomber detonated an improvised explosive device, packed with nuts and bolts to act as shrapnel, in the foyer area of the Manchester Arena . The attack took place after an Ariana Grande concert that was part of her 2017 Dangerous Woman Tour . 14,200 people attended the concert . Many exiting concert - goers and waiting parents were in the foyer at the time of the explosion . According to evidence presented at the coroner's inquest, the detonation of the bomb killed people who were up to 20 metres away . </P> <P> Greater Manchester Police declared the incident a terrorist attack and suicide bombing . It was the deadliest attack in the United Kingdom since the 7 July 2005 London bombings . </P>

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