A further attack may be imminent in the UK, the Prime Minister Theresa May says, as the fourth victim of the Manchester bombing is named
The UK terror threat level has consequently been raised to its highest level of “critical”, Theresa May said
Military personnel will now be deployed to protect key sites under the new threat level.
Meanwhile the mother of Olivia Campbell has named her daughter as the fourth victim of Monday night’s Manchester bombing which killed 22 and injured 59.
Writing on Facebook, she paid tribute to her “precious” daughter, aged 15.
Olivia’s mother, Charlotte Campbell, had issued an emotional plea for information on her daughter’s whereabouts after the Ariana Grande concert.
The change in terror threat comes after investigators were unable to rule out whether suspect Salman Abedi acted alone, the prime minister said.
The prime minister said soldiers would be placed in key public locations to support armed police in protecting the public.
Military personnel may also be seen at other events over the coming weeks, such as concerts, Mrs May said, working under the command of police officers.
BBC security correspondent Frank Gardner says the number of UK troops deployed will be in the hundreds not around the 5,000 figure being reported.
The prime minister said she did not want the public to feel “unduly alarmed” but said it was a “proportionate and sensible response”.
The highest threat level, which is decided by the Joint Terrorism Analysis Centre – a group of experts from the police, government departments and agencies – has only been reached twice before.
Met Police Assistant Commissioner Mark Rowley, who is the national counter-terrorism policing lead, said the investigation was “fast-moving and making good progress”.
“However, a critical line of inquiry is whether the dead terrorist was acting alone or part of a group,” he said.
“We still have critical lines of inquiry they’re chasing down which has led to a level of uncertainty.”
The first time the threat level was raised to critical was in 2006 during a major operation to stop a plot to blow up transatlantic airliners with liquid bombs.
The following year, security chiefs raised it once more as they hunted for the men who had tried to bomb a London nightclub, before going on to attack Glasgow Airport.
Former Salford University student Salman Abedi – understood to be a 22-year-old born in Manchester to parents of Libyan descent – is thought to have blown himself up in the arena’s foyer shortly after 22:30 BST on Monday.
Fans were beginning to leave a concert by US singer Ariana Grande.
Three of his victims have been named – Saffie Rose Roussos, eight, Georgina Callander – thought to be 18 – and John Atkinson, 28.
So-called Islamic State has said – via IS channels on the messaging app Telegram – it was behind the Manchester attack, but this has not been verified.
The wounded, who include 12 children aged under 16, are being treated at eight hospitals across Manchester.
Several people are still missing, including Eilidh MacLeod, 14, from Barra in the Outer Hebrides, Chloe Rutherford, 17, and Liam Curry, 19.
Eilidh’s friend, Laura MacIntyre, 15 – who was also reported as missing – was later identified as one of the seriously injured in a Manchester hospital.
Thousands of people turned out for the vigil in Manchester and to hold a minute’s silence to remember those who died.
Home Secretary Amber Rudd, Labour leader Jeremy Corbyn and Commons Speaker John Bercow stood on stage alongside Manchester Mayor Andy Burnham and Greater Manchester Police Chief Constable Ian Hopkins. Vigils have been held elsewhere, including in Birmingham, where the event was interrupted after a man apparently armed with a large knife and a baseball bat was detained nearby.
The arena bombing is the worst terrorist attack in the UK since the 7 July bombings in 2005, in which 52 people were killed by four suicide bombers.
Witnesses at the arena described seeing metal nuts and bolts among the debris of Monday’s bomb, and spoke about the fear and confusion that gripped concert-goers.
Andy Holey, who had gone to pick up his wife and daughter, said: “An explosion went off and it threw me about 30ft from one set of doors to the other set of doors.”
Emma Johnson, who was waiting for her children, aged 15 and 17, said: “The whole building shook.
There was a blast and then a flash of fire afterwards. There were bodies everywhere.”
Teenager Abigail Walker told the BBC: “I had to make sure I had my sister. I grabbed hold of her and pulled hard. Everyone was running and crying.
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