• 22 people have been killed and 59 injured in a suicide attack at the end of a concert by US singer Ariana Grande at Manchester Arena
• The explosion happened in the foyer of Manchester Arena on Monday night, as crowds began leaving the concert
• The first victim has been named as 18-year-old student Georgina Callander
• A number of people are still missing
• Police say a lone male suicide bomber detonated a home-made bomb, and died at the scene
• Theresa May, said he deliberately chose the place where he could cause "maximum carnage" near the exit as people left
• Police are investigating whether he acted alone or was part of a wider network.
• A 23-year-old man was arrested on Tuesday
• The Queen has expressed her "deepest sympathies"
• The helpline for those concerned about loved ones is 0161 856 9400 or 0161 856 9900

Read more about what happened.

Image source, Getty Images

The O2 Arena in London, where Ariana Grande is scheduled to perform on Thursday 25 May, said it has a "thorough security regime" in place.

So-called Islamic State (IS) has claimed it was behind the attack. The statement was made via IS channels on the messaging app Telegram. The group frequently claims attacks in their aftermath.

Manchester United's players hold a minute's silence in memory of the victims of Monday night's terror attack.

Image source, Reuters

Two students from Harrogate Grammar in Yorkshire remain in hospital in Manchester but are not seriously injured, the school's headmaster said in a statement.

Richard Staff said: "We know at least two of them were injured, thankfully not seriously, but are awaiting treatment in hospitals in the Manchester area."

Derek Cartwright, the chief executive of the North West Ambulance service, has praised ambulance services from around the country and members of the public who helped in dealing with last night's attack.

“We would like to convey our thanks to our colleagues in West Midlands, Wales, Yorkshire and East Midlands ambulance services who provided mutual aid so we could continue reaching patients who needed our help in our communities," he said in a statement.

“The co-operation of the public has been very gratefully received. We had many messages throughout the night from people volunteering their services, blankets, first aid skills and tea.

"It was extremely heart-warming to receive such messages and demonstrates how a city can pull together during these difficult times."

Some more information has emerged about the bomb used by the attacker in the Manchester Arena attack.

Police have said it was a "home-made" improvised explosive device.

Witnesses have told the BBC there were nuts and bolts packed into the bomb.

British security service MI5 has said it remains "relentlessly focused, in numerous current operations, on doing all we can to combat the scourge of terrorism".

Image source, Instagram

The first victim has been named as 18-year-old student Georgina Callander.

She was studying health and social care at Runshaw College in Lancashire.

Here she is pictured two years ago with Ariana Grande, who was performing at the concert last night.

Social media is helping people search for missing relatives following the terror attack at Manchester Arena.

Image source, Twitter

Chloe Rutherford, 17, and Liam Curry, 19, (pictured) of South Shields, are missing.

Their faces were among many to appear on Twitter with the #MissingInManchester hashtag.

It is thought Liam took this photo before he and his girlfriend Chloe went into the arena.

No decision has yet been made on whether two big sporting events will go ahead in Manchester at the weekend.

The Great City Games, featuring a number of leading athletes, is due to be held in Manchester city centre (Deansgate) on Friday. It is an unticketed, free event for the public scheduled to be broadcast on BBC Two.

The Great Manchester Run - a public half marathon and 10k run - is scheduled to take place on Saturday.

A spokesman for Nova, which organises both events, said: "We are awaiting advice from the authorities on these events and will provide an update as soon as is possible."

Imam Qari Asim MBE, Imam of Leeds Makkah Mosque and independent member of the government's Anti-Muslim Hatred Working Group, said the victims "are very much in our thoughts and prayers".

"This was an attack on all of us," he added.

"We absolutely condemn the barbaric acts of an individual determined to spread hate and prejudice across the world.

"The senseless murder of innocents is utterly deplorable.

"We must not let them win by creating the divisions they so desperately seek to sow."

Simon Stone
BBC Sport in Stockholm

Greater Manchester Police representatives in Stockholm have been meeting with their Swedish and Dutch counterparts to discuss the impact of last night's attack on Wednesday's Europa League football final between Manchester United and Ajax.

It is understood the GMP delegation, led by chief superintendent John O'Hare, have been in communication with Manchester-based colleagues throughout the night.

Manchester United and Ajax officials, plus representatives of European football's governing body Uefa, are also due to attend what is being described as a routine meeting.

United say they do not comment on the team's security plans.

Uefa has accepted a request from the club not to hold their pre-match press conference this evening.

Image source, PA