Superintendent Neil Bhole, of Greater Manchester Police, is leading the investigation into the crash and is appealing for witnesses.
Firstly, I want to extend my deepest sympathies to the family and friends of those who have sadly died. This is an absolute tragedy and our thoughts are with them as they try and come to terms with what has happened.
Specially trained Family Liaison Officers are with the family and offering them as much support as they need throughout what is clearly going to be a very traumatic next few hours, days and months.
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Ursula Keogh, 11, went missing on Monday around 3.30pm. She was dressed in her school uniform.
"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.