Jade Baynes, 18, from Hull, was told to run from the area by armed police after leaving the concert arena. She said she heard loud bangs and what sounded like gunshots just after the entertainment had finished.
There were just a loud bang and a flash and everyone tried to scramble out. An alarm came on telling everyone to stay calm but leave as quickly as possible.
Jade and her friend Jasmine Mia, 21, also from Hull, said there appeared to be some sort of commotion in the first tier of the arena, with a number of stewards stood around the seats.
My bolding. Maybe relevant, maybe not.