BBC Defence Editor Mark Urban explains in this Newsnight interview why the terror threat has been raised from "severe" to "critical". "It suggests a belief among intelligence experts that a further attack could be imminent," he says.

Morrissey, the Manchester-born singer and former frontman of legendary band The Smiths, is well known as someone who doesn't pull his punches.

Now, in a blistering post on Facebook, he has accused public figures ranging from The Queen to the mayor of Greater Manchester, Prime Minister Theresa May to the mayor of London, of failing to respond properly to the bombing, which was claimed by so-called Islamic State.

Ariana Grande has arrived back in Florida, where she was met by her boyfriend, Mac Miller, TMZ reports, external.

After the attack on her concert venue in Manchester, she had tweeted to say she was "broken".

Daniel Sandford
Home Affairs Correspondent

Salman Abedi was born in Manchester on New Year's Eve 1994. His parents were Libyans who had fled, after becoming opponents of Colonel Gaddafi's repressive regime.

Having spent a few years in London, the family moved to Manchester where his father used to do the call to prayer at a mosque in Didsbury.

Abedi went to school in Manchester and to Salford University before dropping out. And friends remember him as a good footballer, a keen supporter of Manchester United and a user of cannabis.

He has a sister and two brothers. His mother and father are now believed to be back living in Libya, and for a while he left Britain too, but he returned in the last few days - apparently to carry out the worst bombing in Britain since the 7 July 2005 attacks on the London Underground.

Read more about what we know of the attacker

"Big pop gigs do something incredibly important" for kids, Alexis Petridis writes in a funny, reflective, poignant piece, external in the Guardian, where he recalls the time he took his eldest daughter, then aged seven, to a Jessie J concert as a birthday treat.

"Mostly it was the way it gave her a first glimpse of a world that was previously outside her experience, a more adult, or at least more mature world than the one she knew, a world that would one day be her own, and how excited she was to see it, how – as she put it – grown-up it made her feel...

"Giving people their first taste of freedom and independence: that strikes me as something at the top of the chart of Incredible Things Music Can Do. It is also something that the kind of people who manipulate others into blowing themselves up in public places hate."

Image source, AFP

Andy Burnham has been thanking hospital staff in Greater Manchester for their work on the city's "darkest night".

Baroness Chakrabarti, the shadow attorney general, has cautioned against a "knee-jerk" response to the attack, though she says she has not heard anything yet to suggest this is the case.

"I think it's certainly the kind of day for calm, a certain pause for thought and unity," the Labour peer told the BBC's Newsnight programme.

"And then of course for resources. And we've heard, we hear, about the threats being raised and the resources that are to be deployed. I've not heard anything as yet that suggests a knee jerk to bring in sweeping powers."

As darkness fell, people were still visiting Manchester's Albert Square to pay their respects to the victims with candles and flowers. Getty photographer Jeff J Mitchell caught the sombre mood.

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

"Military personnel will remain under the command and control of the police service," Assistant Commissioner Rowley added in a separate statement.

"At this time we are asking the public to remain calm but alert," he said.

"If you see anything that causes you concern, then let us know immediately, if you have suspicions about someone's behaviour call us. Look out for anything that seems out of place, unusual or doesn't seem to fit in with day-to-day life.

"It may be nothing, but if you see or hear anything that could be terrorist related, trust your instinct no matter how small then ACT and call 999."

Assistant Commissioner Mark Rowley, National Counter Terrorism Policing lead, has been talking about the decision to raise the threat level to "critical".

The decision was taken due to the "uncertainty currently flowing from the investigation", he explained.

Commenting on Operation Temperer, announced earlier by Prime Minister Theresa May, he said, "All those extra police officers we are putting on the streets already will be given military support."

"We could even use military support at key locations," he added.

"'Critical' is a very unusual and rare step," he emphasised.

Image source, Metropolitan Police

Manchester and other attacks in mainland Europe and the UK have been taken into consideration in planning for the Uefa Champions League in Cardiff next month, Assistant Chief Constable Richard Lewis of South Wales Police has said.

"Extensive searches and installation of security measures for the Champions League finals have been taking place in Cardiff during the past week and will continue in the run-up to the event," he added.

"Access to areas around the stadiums on event days will be extremely limited, and ticket-holders can expect to be subject to rigorous security checks. Measures will also be taken to restrict vehicular access to a number of areas within Cardiff."

Image source, Reuters

Image source, The Telegraph

The Telegraph leads on British troops being deployed to support the police after the UK terror threat level was raised to critical.

Frank Gardner
BBC Security Correspondent

The first echelon of troops deployed in support of the police will be in the hundreds, writes the BBC's security correspondent.

Exact details are still being worked out between the police and Ministry of Defence.

Image source, The Times

The Times says that Salman Abedi, thought to be Monday's suicide bomber, flew to Manchester from Libya in order to carry out the attack.

Image source, Daily MIrror

Wednesday's Daily Mirror describes the bombing as "an attack of grotesque barbarity".

Image source, Daily Express

The Daily Express poses the question: "How could jihadi barbarian murder our beautiful and innocent children?"

Image source, The Guardian

The Guardian leads on the victims of Monday's suicide bomb attack, the youngest of whom was eight years old

The university has issued a statement from Sam Grogan, Pro-Vice Chancellor, Student Experience: