Britain has increased its security threat level to "critical" from "severe" following the attack, May said in a later televised statement, adding that members of the armed forces would boost security at key sites and military personnel might be deployed at public events such as concerts and sports events.
Police on Tuesday said they believed British-born Salman Abedi, aged 22, carried out Britain's deadliest bombing in almost 12 years and Prime Minister Theresa May said another attack could be imminent. Their properties at Elsmore Road in the Fallowfield area were raided by police following the attack. "The spirit of Manchester and the spirit of Britain is far mightier than the sick plots of terrorists-and that is why the terrorist will never prevail". Britain's worldwide terror threat level was last at the critical level in June 2007.
Both women were injured in the blast and are being treated at separate injuries. Twitter and Facebook lit up with heartbreaking appeals for the missing. Sources from People magazine reported that as she departed the private jet, the 23-year-old singer "looked distraught and like she has been crying. I've called all the places, the hotels where people said that children have been taken and I've called the police".
Families were separated, with dozens of young people taken to nearby hotels overnight, and some parents were still desperately searching for their children on Tuesday.
Witnesses said the blast scattered bolts and other bits of metal, apparently meant to maximize injuries and deaths.
"There was this massive bang". "And there was just alarms going off, police everywhere". Then the screaming started.
Some 59 people were taken to hospital, many with life-threatening conditions. My partner was helping to try to stem the blood from this one person. "It was just very bad".
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Asked whether the USA leaks had compromised the investigation, she said: "I wouldn't go that far but I can say that they are perfectly clear about the situation and that it shouldn't happen again".
"I think they were just saying that to calm people down before they got out".
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May described the attack as an act of "sickening cowardice". Accompanied by her husband Prince Philip, as well as Prince Charles and his wife Camilla, the queen stood at the top of the steps leading down from Buckingham Palace as the national anthem played.
As a kid, Abedi studied at a Manchester school.
Labour's Mike Gapes, who hopes to return to Parliament in the Ilford South seat, said: "We must not allow murderous terrorists to undermine our democratic society".
Saffie Roussos, 8, was the youngest victim identified so far. "She just wants to be with her family and loved ones right now". "Saffie was quiet and unassuming with a creative flair". "It is a possibility we can not ignore that there is a wider group of individuals linked to this attack".
It did not name the bomber, as it usually does in attacks it has ordered, and appeared also to contradict a posting on another Islamic State account, Amaq, which spoke of "a group of attackers".
"This wicked ideology must be obliterated".
The 23-year-old pop star is on a European leg of her "Dangerous Woman Tour" and canceled shows scheduled for Thursday and Friday at the 02 Arena in London.
"These searches are connected to Monday's horrific attack on the Manchester Arena, but this is a fast moving investigation and we are keeping an open mind at this stage", police said in a statement.
"The explosive devices were detonated in the shameless concert arena, resulting in 30 (sic) crusaders being killed and 70 others being wounded".
Pop concerts have been a terrorism target before.
Manchester itself has seen attacks before, but not this deadly.