A mother from Leeds is in hospital with stomach and leg injuries after being injured in the terrorist incident.
Gary Walker and his wife were waiting in the foyer for their daughters Abigail and Sophie.
Gary said the couple heard the last song, people started leaving, and then there was a massive bang.
Concerned relatives and friends have been urged to call 0161 856 9400 - an emergency police hotline set up after the explosion at Manchester Arena on Monday evening.
Greater Manchester Police are also offering help or assistance at the city's Etihad Stadium.
Anyone who needs help or assistance after last night's incident at Manchester Arena help is available at the Etihad Stadium access Gate 11
Anyone with information about the blast should call the national anti-terrorist hotline on 0800 789 321.
Anyone with footage from Manchester Arena that could assist the police investigation has been urged to upload it to the site for Police Appeal For Photos/Videos.
Here's the latest for North and West Yorkshire:
And for East and South Yorkshire and Lincolnshire:
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Manchester Arena have said the explosion on Monday evening took place outside the venue.
In a statement posted on their Twitter page, they wrote: "The incident took place outside the venue in a public space.
"Our thoughts and prayers go out to the victims."
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The Queen visited the world's most famous horticultural extravaganza today before the show opens to the public tomorrow.
Here's Michael Billington's report:
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