Intelligence sharing between the UK and the US resumes after row
Police search a property in Wigan following an assessment by a bomb disposal team
Police say they have made "significant" arrests - eight people are still in custody
Raids on properties have yielded "very important" items, police say
The Queen has visited victims at Royal Manchester Children's Hospital
A national minute's silence has been held to remember victims
Suspected suicide bomber is UK-born Salman Abedi, 22, of Libyan origin
Norman Smith
Assistant political editor
"I have never, ever seen armed soldiers at Westminster," says BBC assistant political editor Norman Smith, as troops take up position in Downing Street and outside Parliament.
Soldiers are also expected to help guard "airports, nuclear plants, key energy terminals, that sort of thing" to free up armed police to conduct patrols, Norman adds.
Our Home Affairs Correspondent tweets:
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Head teacher Chris Upton pays tribute to the youngest attack victim, Saffie Roussos, 8
Image source, PAChelsea have cancelled their Premier League victory parade, due to take place on Sunday, in the wake of the attack.
The club say it would be "inappropriate" with the UK terror threat at its highest level.
Chelsea had planned an open-top bus tour with the trophy.
23 May 2017
BBC Parliament
Freeview channel 131
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Image source, FacebookFriends pay tribute to former Bury College student John Atkinson, who was among the 22 people murdered at Manchester Arena.
Friends pay tribute to the former Bury College student, one of the 22 people murdered at Manchester Arena.
Read MoreBombing victim Nell Jones's headteacher Denis Oliver has paid tribute to the Year 9 pupil:
Quote MessageIt is with great sadness that we reflect on the loss of Nell Jones from our school community. Nell's family have been searching for her since the incident in the hope that they would find her being cared for in hospital. Unfortunately, the police have now confirmed that Nell died at the scene.
Quote MessageWe have now informed the whole of the school community through assemblies in which the students and their teachers reflected together on memories of Nell and shared their grief together. We are all devastated by the loss and as a school community we must now come to terms with what has happened.
Quote MessageNell was a very bright and popular student. Her form tutor, David Wheeler said: "Nell was a very popular girl, always smiling, always positive. Her tutor group have been together since the transition from primary school. It feels like they have lost a sister not a classmate."
Mr Oliver continues:
Quote MessageOver the coming days we will give everyone ample opportunity to pass on their memories of Nell. In the meantime we will be providing professional support to children,staff and parents as necessary. The wellbeing of all of the children within our close school community is now our number one priority.
Quote MessageI have met with Mr and Mrs Jones this morning and offered our sincere condolences on behalf of everyone at our school. I cannot imagine the loss they must feel. Nell's family are devastated by the news and have asked that they be allowed to come to terms with their loss in private."
Manchester attack: Mum addresses head-on her children's worries about terror
A mother of three answers her children's questions about the tragic events in Manchester.
A mother of three answers her children's questions about the tragic events in Manchester.
Read MoreHuffington Post political reporter tweets...
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Louise Bolotin, a freelance journalist who lives in the raided Granby House building, said the fire alarm went off before police broke into a flat on the third floor.
Quote MessageI came running down the front staircase, six floors, and got to the front entrance and was met by a police officer in full-on tactical helmet, face mask, machine gun. I was expecting to see the fire brigade. I said 'what's happening?' and he just said 'out'."
Fellow resident, Marcus Murray, said people often came to stay in flats in the building just for the weekend. He added:
Quote MessageI wanted to come back into my flat but there were unmarked cars. I got to the front door and there was a guy with a gun who said I can't go in. I feel a bit uneasy. Going to sleep is going to be a bit difficult. It just feels unsafe. You just don't expect it do you? It's very strange."
Police have raided a block of flats close to Manchester Piccadilly Station following Monday's bombing.
Residents said armed police and men clad in balaclavas stormed the Granby House building, Granby Row, in the centre of the city.
The railway was briefly closed during the raid.
A GMP spokeswoman said: "That search is ongoing.
"In order to do this safely, we briefly closed a railway line, but it has now been reopened."
Security is increased to protect key sites following the Manchester Arena bombing, including putting armed police and military personnel on the streets.
Image source, EPA
Image source, ReutersU2, who are currently on tour in the US marking 30 years since their album the Joshua Tree was released, surprised a TV studio audience with a rendition of their song I Still Haven't Found What I'm Looking For.
Earlier on the Jimmy Kimmel Show, singer Bono spoke about the band's feelings, external following the Manchester bomb attack.
"They hate music, they hate women, they hate little girls, he said.
"They hate everything we love and the worst of humanity was on view in Manchester but so was the best, as people took complete strangers into their homes.
"Manchester has an un-defeatable spirit."
Watch the band's performance below.
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More than 100 people, including councillors, council staff and residents have gathered at Brighton Town Hall for a minute's silence to remember the victims of the Manchester attack.
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Victim Jane Tweddle-Taylor, a receptionist at South Shore Academy School in Blackpool, was a "bubbly, kind, welcoming, funny, generous" colleague, the school's principal has said.
Jane Bailey described Miss Tweddle-Taylor, 51, as a "well-loved member of staff" and "wonderful friend and colleague".
She added: "Our thoughts are with her friends and family at this terrible time."
Police say they are searching a property in Manchester city centre as part of the investigation into the "horrific incident" at Manchester Arena.
In order to do this safely, they say, they briefly closed a railway line - but it has now been reopened.