Fresh arrests have been made in the Manchester bombing probe after police carried out a controlled explosion during a raid on an address in the Cheetham Hill area of the city.
Before arriving at the concert, which had attracted a young audience including many children, Abedi is believed to have put the final touches to his bomb in a city centre flat.
Members of Manchester suicide bomber Salman Abedi's network are still potentially at large, British interior minister Amber Rudd said on Sunday, after the terrorism threat level was lowered due to significant progress in the investigation.
When respondents were asked what should happen to "British citizens who have travelled to fight in Syria, Libya or other warzones and then seek to return to Britain", 55 per cent agreed they should "be blocked from re-entering Britain".
Investigators say they have dismantled a large part of Abedi's network, but expect to make more arrests.
On Monday night, Abedi bombed Manchester Arena, where Ariana Grande was performing to thousands of fans. Eleven other men, aged between 18 and 44, are in custody.
"The operation is still really at full-tilt in a way and so until the operation is complete we can't be entirely sure that it's closed".
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Bomber Salman Abedi, a 22-year-old Briton of Libyan descent, killed 22 people and himself on May 22 at an Ariana Grande concert.
Armed police mingled with spectators as crowds gathered to watch the runners, including mayor of Greater Manchester Andy Burnham.
Armed police were on the streets outside London's Wembley Stadium, and security guards conducted extra bag checks, as 90,000 fans arrived for the FA Cup soccer final between Chelsea and Arsenal, one of the biggest sporting events of the year.
Two of the victims, Courtney Boyle and stepfather Philip Tron, have been remembered at a moving service at the Angel of the North on Friday.
Labour Party leader Jeremy Corbyn risked being assailed for politicizing the attack on Manchester Arena that killed 22 people by claiming in his first post-atrocity speech that his party would change Britain's foreign policy if it takes power after the June 8 vote by abandoning the "war on terror". "But I grew up in Ireland, so bombs did go off there and life does go on". She also urged fans to donate to the Manchester Evening News fundraising appeal, which has raised more than £5 million.
Former U.S. President Barack Obama offered his condolences to the victims and support for those wounded in the Manchester bombing during a meeting Saturday with Prince Harry at London's Kensington Palace. "They picked the wrong people to mess with this time".
On Friday she pledged to return to the city to hold a benefit concert to raise money for the victims and their families. "We can't let the terrorists win by dissuading us from going about our normal business".