On 22 May 2017, an Islamist terrorist carried out a bombing at an Ariana Grande concert in the Manchester Arena; the bomb killed 23, including the attacker, and injured over 800. It was the deadliest terrorist attack and first suicide bombing in Britain since the 7 July 2005 London bombings. It caused worldwide condemnation and changed the UK's threat level to "critical" for the first time since 2007.