She rang police, hospitals, hotels, but was told to wait. She took to Facebook and Twitter to share her daughter's photo and made impassioned pleas for help on television and radio.

But on Tuesday night Ms Campbell knew her 15-year-old daughter Olivia would never return home.

Olivia was identified by her mother as one of the 22 victims of the suicide bombing at Manchester Arena, where US pop star Ariana Grande had played to nearly 20,000 people.

"RIP my darling precious gorgeous girl Olivia Campbell taken far far to soon go sing with the angels and keep smiling mummy loves you so much," Ms Campbell wrote on Facebook, before taking to Twitter to say, "RIP my beautiful princess Olivia Campbell. Gone far too soon & never will be forgotten. I love you."

The post attracted an enormous outpouring of grief and condolences.

"So sorry for your loss, your daughter is absolutely beautiful. Prayers from the USA," Debra Sanders wrote.

"Just know that there's an entire world out here that is grieving for your loss," Peggy Jones wrote.

As Manchester awoke on Wednesday morning, more of the 22 victims of the blast had been identified.

Martyn Hett, Kelly Brewster, Marcin and Angelika Klis, and John Atkinson were named among victims.

Also among the victims of the blast were eight-year-old Saffie Rose Roussos and Ariana Grande superfan Georgina Callander, 18.

Martyn Hett

PR manager Martyn Hett, from Stockport, was believed to have been at Monday night's concert with a friend, the BBC reported.

The 29-year-old's boyfriend Russell Hayward has been tweeting about his "soulmate" who was missing after the bombing.

But he later tweeted news that "iconic and beautiful Martyn" did not survive.

Mr Hett's brother, Dan Hett, also tweeted: "They found my brother last night. We are heartbroken."

Kelly Brewster

Kelly Brewster's partner shared this photo of the 32-year-old Sheffield woman, another victim of the Manchester Arena bombing. Photo: Facebook/@ian.j.winslow

Kelly Brewster, from Sheffield, died after she reportedly shielded her niece from the blast at Manchester Arena on Monday night.

Ms Brewster's uncle Paul Dryhurst said the 32-year-old woman had "heroically shielded" her 11-year-old niece from the blast in the foyer, the BCC reported.

Her partner, Ian John Winslow, paid tribute to Ms Brewster on Facebook. She is survived by their daughter Pheobe.

"Not sure how this works but it isn't good news. Kelly Brewster wasn't one of the unidentified hospital patients. She has sadly passed away in the terror attack yesterday," he wrote.

"Kelly really was the happiest she has ever been and we had so many things planned together. My daughter Phoebe will be absolutely devastated like we all are. Love you loads"

Olivia Campbell

Olivia Campbell, from Bury in Greater Manchester, became one of the most high-profile missing victims, after her mother's desperate pleas for help on social media caught the attention of people around the world.

Ms Campbell's posts were shared tens of thousands of times by people across the world, with Olivia's name trending on Twitter.

"It's the most horrible feeling ever, to know that your daughter's there and you can't find her and you don't know if she's dead or alive," a tearful Ms Campbell told US news network CNN.

"I don't know how people can do this to innocent children."

The Manchester mother broke down in tears on ITV's Good Morning Britain just hours before she shared the news of her daughter's death.

"All I know is she was at the Manchester Arena with her friend watching Ariana Grande and she's not turned up yet," she said.

"I can't get through to her. I've called the hospitals, I've called all the places, the hotels where people say that children have been taken. I've called the police. There's no news, I've just got to wait. I'm waiting at home just in case she turns up here."

Ms Campbell told the BBC she last had contact with her daughter shortly before Grande took to the stage.

"She was at the concert, she'd just seen the support act and said she was having an amazing time and thanking me for letting her go," she said.

"She was with her friend, Adam. Adam was found about half an hour ago - he's in hospital - but Olivia's not been found yet ... I'm just hearing nothing."

Many parents were still waiting on Wednesday, more than 24 hours after the terror attack, to find out if their children were among the dead or injured, sharing photos on Facebook and Twitter with the #MissingInManchester hashtag.

Marcin and Angelika Klis

Marcin and Angelika Klis have been confirmed as two more victims of the bombing in Manchester. Photo: Facebook

Polish couple Marcin and Angelika Klis had gone to Manchester Arena to collect their daughters after the concert on Monday night.

In the hours after the bombing, their daughter Alex tried to desperately find them, writing on Facebook: "Anyone who is in any safe place or hospital in Manchester, if anyone comes across my parents please please let me know as they've been missing ever since the attack."

Poland's Foreign Minister Witold Waszczykowski told a Polish radio station, "The parents came after the concert to collect their daughters and unfortunately we have information that they are dead. The children are safe."

John Atkinson

John Atkinson, a competitive dancer and pop music fan from Radcliffe, was reportedly leaving the venue when he was fatally injured by the blast.

Local adult dance troupe, Freak Dance Radcliffe, paid tribute to the 26-year-old, remembering him as a "happy gentle person" and a "real pleasure to teach".

"Today is an amazingly sad day! 'We have lost a member of our dance family," read the group's message onFacebook.

"He was a true friend, not just to our staff but many of the parents and students from the school. Our thoughts are with the family at the very sad and hard time!"

Other friends posted their condolences online, saying Mr Atkinson was an "amazing young man" and a "beautiful soul".

Facebook friend Gill Corless, posted a photo of a candle, with the message: "My candle lit for John Atkinson and the 21 others who lost their lives in the evil senseless attack in Manchester, shine bright in the sky tonight john."

Saffie-Rose Roussos

Saffie Roussos, eight, died in the Manchester bombing. Photo: AP

Eight-year-old Saffie-Rose Roussos died from her injuries at the concert on Monday night.

Saffie Rose Roussos, from the small English town of Leyland, Lancashire, was named as a victim of the attack on Tuesday.

It followed reports she had been missing.

The news has come as a tremendous shock to her school community, said Chris Upton, headteacher at Tarleton Community Primary School

"The thought that anyone could go out to a concert and not come home is heartbreaking," Mr Upton said.

"Saffie was simply a beautiful little girl in every aspect of the word.

"She was loved by everyone and her warmth and kindness will be remembered fondly. Saffie was quiet and unassuming with a creative flair."

Georgina Callander

Georgina Callander with US pop star Ariana Grande. Photo: Instagram/georgina.bethany

Georgina Callander, 18, was the first named victim of the tragedy, and was a devoted fan of Ariana Grande, having met her in June 2015.

On Instagram, Georgina posted a photo of their meeting with the caption: "She was so cute and lovely. I hugged her so tight and she said she loved my bow. I can't get over this, I never will."

The teenager, from Whittle-le-Woods in Lancashire, was a student at Runshaw College in Leyland.

On Tuesday night, candlelit vigils were held in Manchester and in the village of Tarleton and Hesketh Bank for Saffie and Georgina.

Flowers and messages were laid in Tarleton's Marks Square.

"As darkness has fallen on our little village tonight the candles are burning brightly for [Georgina] and Saffie, young Angels in the sky and all the other victims of this atrocity," one local wrote on Facebook.

"Watching [Georgina's] mum and family and little children cry and hug each other in bewilderment at the vigil was heartbreaking. So Proud of Tarleton folk standing united in grief."

Georgina Callander's family thanked the community for their support.

"Thank you all who attended the vigil, it was amazing couldn't of asked for anything more, from all the Callanders," Daniel Callander wrote on Facebook.

with The Telegraph