<sod >" Liverpool City Region metro mayor Steve Rotheram told the BBC he had been at the concert with his wife and daughters and had seen manyÂ people lying on the ground injuredÂ as he desperately searched for his family.< eod>< sod > " One eyewitness named Andy who had been at the concert with his wife and daughters told the BBC he had seen many people lying on the ground injured as he desperately searched for his family. He said there were "a good 20 to 30 people lying injured" close to the box office, on the way into the arena. "Whoever's done it has done it on a kids' concert," he said, adding that the whole building had shook from the force of the explosion. Another eyewitness said he was thrown "30 feet in the air" by the force of the explosion. A witness named Karen who was at the concert with her husband and children described the pandemonium as thousands tried to escape the venue after the explosion sound was heard. "It was just chaos.< eod>