This means another attack is imminent in the United Kingdom and military personnel will be deployed in key locations to help armed police protect the public.
Police said soldiers would initially be on guard duties at fixed points and could also be sent to patrol transport hubs, concerts and sports events.
The raising of the threat level means further attacks may be imminent.
As Britain prepares to leave the European Union, the bombing underscored the possible threat of losing access to the bloc's intelligence and security collaboration framework.
Witnesses related the horror of the blast, which unleashed a stampede just as the concert ended at Europe's largest indoor arena, full to its capacity of 21,000.
"When we left, down the stairs there was probably early teenagers lying on the floor covered in blood and blood on the walls where they'd been laid, so it was just horrifying", female concert-goer Alex Grayson told AFP.
Britain raised its threat level from terrorism to "critical" after an emergency government meeting late Tuesday amid concerns that the 22-year-old Abedi may have accomplices who are planning another attack.
Citing CCTV footage recovered by detectives, The Times reported Abedi had placed the device in a suitcase which he set on the ground before it detonated.
"We don't have that information yet, no", she said.Читайте также: McCain: Trump-Russia allegations like a 'lousy movie'
In addition to those killed in the concert attack, Manchester officials raised to 119 the number of people who sought medical treatment after the attack, including those who travelled to hospitals on their own. Manchester! Manchester!' before a lone voice called out: 'There is a light and it never goes out.' Amber Rudd, Andy Burnham, Jeremy Corbyn and Tim Farron attend a vigil in Manchester's Albert Square. One mother's 15-year old daughter was confirmed to have died Tuesday.
There was panic after the explosion, which struck around 10:30 p.m. (2130 GMT) Monday night as Grande was ending the concert.
After the chaos, families desperately searched for loved ones.
The attack was the deadliest in Britain since four suicide bombers killed 52 London commuters on subway trains and a bus in 2005.
The bombing also elicited painful memories of the 2015 terror attacks in Paris, where most of the 130 killed were at the Bataclan concert hall.
What it also means immediately is that soldiers will be deployed to Britain's streets to support the police.
Britain's Queen Elizabeth and Prince Philip observe a minute's silence to honour the victims of the attack on Manchester Arena at the start of a garden party at Buckingham Palace in London, May 23, 2017.
"They feel they have no choice other than to say it may be imminent".
In a city famed globally for its musical traditions and football teams, showbusiness stars and teams expressed their horror at the carnage.При любом использовании материалов сайта и дочерних проектов, гиперссылка на обязательна.
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