Latest: Manchester holds vigil in wake of attacks

Latest: Thousands of people have gathered in the centre of Manchester in a show of defiance, declaring they will not be "beaten" or "intimidated" in the wake of the terror attack.

• An explosion at an Ariana Grande concert in the Manchester Arena at around 10.35pm last night has been called a terror attack by British Police.
• 22 people, including many children, have been killed and 59 people, including 12 under the age of 16, have been injured in the blast.
• The attack was carried out by a lone male suicide bomber who detonated an improvised explosive device. He died at the arena.
• He has been identified as 22-year-old Salman Abedi.
• Security services are investigating whether he acted alone or was part of a network.
• A 23-year-old has been arrested in South Manchester in connection with the incident.
• Islamic State has claimed responsibility for the attack.
• The first victim has been named as college student Georgina Callander.
• Eight-year-old schoolgirl Saffie Roussos was also killed.
• A vigil will be held at 6pm on Tuesday in Albert Square, Manchester.
• Extra police officers have been put on duty in London in the wake of the attack, Metropolitan Police Commissioner Cressida Dick announced.
• A controlled explosion was carried out on Tuesday afternoon, as part of the investigation, at an address in Fallowfield.