23 May, 2017
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The local ambulance service said on Twitter it had taken 59 casualties from the incident and treated "a number of walking wounded on the scene". She tweeted several hours later: "broken. from the bottom of my heart, i am so so sorry. i don't have words".
People running down stairs as they attempt to exit the Manchester Arena after a blast, where US singer Ariana Grande had been performing, in Manchester, Britain in this still image taken from video May 22, 2017.
No group has claimed responsibility for the incident in Manchester.
Following the attack, British Prime Minister Theresa May has suspended her General Election campaign.
They said in a statement: "Words can not express our sorrow for the victims and families harmed in this senseless attack".
Since opening in 1995, the Manchester Arena has welcomed acts like U2, Lady Gaga, and the Rolling Stones.
"Everybody was panicking", Isabel Hodgins, an actress who had been attending the concert told Sky News.
"The corridor was full, it smelled of burning, there was quite a lot of smoke as we were leaving". "A gentleman said 'run!' so we ran".
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Robinson said she took dozens of teenage girls to the nearby Holiday Inn Express hotel and tweeted out her phone number to anxious parents telling them to meet her there.
"It was one bang and essentially everyone from the other side of the arena where the bang was heard from suddenly came running towards us as they were trying to exit Trinity Way and that was blocked so everyone was just running to any exit they could find as quickly as they could".
Police carried out a "controlled explosion" in the Cathedral Gardens area near Manchester Arena.
Delgado said: "There were people on the floor". People just dropped everything.
Semino said she had been standing by the arena's ticket office when the explosion went off. "I don't have words", she tweeted later. "I can't even describe it".
"I looked around and people were just spilling down, heading out of the building".
Despite wounds to her neck and a leg, Semino dashed into the auditorium in search of her daughter while her husband, who had only a minor injury, stayed behind to help an injured woman.
Facebook activated its Safety Check feature for people to mark themselves as safe or check on friends or loved ones. This makes the second terror attack in very recent memory for Britain, as the Manchester Explosion followed a car-based attack on the Westminster Bridge, which took the lives of four as well as a subsequent stabbing of a police officer in front of Parliament. The victim, 61-year-old William Rust III, of Cincinnati, was riding his bike along the shoulder of USA 52 in Anderson Twp., just east of Cincinnati Monday afternoon, our news partner WCPO-TV.