Ariana Grande’s heartbreak after 22 people including kids killed and at least 59 injured in suicide bomb attack at her Manchester Arena gig

ARIANA Grande has written an emotional post on social media saying she is "broken" following the terror attack at her Manchester Arena concert last night.

The pop star - who is "safe and well" following the massacre which left at least 22 dead - posted the emotional message on her Twitter account.

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She said: "Broken from the bottom of my heart, I am so so sorry. I don't have words."

It was revealed this morning that she had cancelled her world tour following the horrific attack, which also left at least 59 injured.

She is believed to have axed her gigs in London later this week, and put her entire European tour on hold, according to .

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London's O2 Arena tweeted warning ticketholders that the concerts on Thursday and Friday may be cancelled in the wake of the attack.

The O2 posted a short statement confirming it would advise on whether the shows would go ahead shortly.

A representative from the singer's label confirmed yesterday the 23-year-old is “okay”, although reportedly "in hysterics" following the bombing.

Footage appearing to show Ariana Grande's tour bus arriving back at her Manchester hotel has since been shared on social media.

Tom Cross posted the video on Twitter, claiming the popstar's bus had returned to the Lowry Hotel around "2 hours after reports of the first explosion".

Ariana’s support act BIA tweeted: “GUYS WE ARE OKAY !!! THANK YOU WE LOVE YOU.

She added: “@tareemax was my angel tonight.”

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Witnesses on social media have reported hearing a “massive bang” before screaming crowds rushed out of venue with police confirming there was an explosion.

Police said: "Emergency services are currently responding to reports of an explosion at Manchester Arena.

"There are a number of confirmed fatalities and others injured.

"Please AVOID the area as first responders work tirelessly at the scene.

"Details of a casualty bureau will follow as soon as available."

The blast was said to have been caused by a nail bomb, with witnesses reporting seeing "nuts and bolts flying everywhere."

Paramedics on the scene also spoke of treating "shrapnel-like" injuries.

Concertgoers fled to nearby Manchester Victoria Station, which was later evacuated and has since suspended all rail services for Tuesday.

Witnesses have reported seeing emergency services swarming at the scene as video footage shows crowds fleeing and armed cops arriving.

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Catherine Macfarlane said: "We were making our way out and when we were right by the door there was a massive explosion and everybody was screaming.

"It was a huge explosion - you could feel it in your chest. It was chaotic. Everybody was running and screaming and just trying to get out of the area."

Sasina Akhta told the : “She did her last song, we were in the lower tier and there was an explosion behind us at the back of the arena. We saw young girls with blood on them, everyone was screaming and people were running. There was lots of smoke.”

A Twitter user said: "Everyone screamed and ran out I've never been so scared in my life."

Another added: "Just got out of Manchester arena after seeing Ariana perform. There was a loud bang when the lights came on & everyone ran out screaming."

Actress Julie Hesmondhalgh, who played Hayley in Coronation Street, was among those tweeting asking for information with her daughter and husband caught up in the chaos.

She said: "My husband and daughter safe but what is happening at MEN please? They were told mass panic after loud noise that wasn't explosion."

Others have turned to social media in a bid to check on relatives with one woman saying about 50 kids have been taken to a Holiday Inn for safety.