The shadow environment secretary Mary Creagh has accused the Government of another "U-turn" over the badger cull postponement.
She said the Environment Secretary Owen Paterson had been "yanked back" from a trip to promote British produce in France by the Prime Minister "who told him it was game over" for the cull.
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The hashtag #RoomForManchester was being widely shared.
Witnesses reported hearing a "huge bang" at the venue during the concert on Monday evening.
ITV News travels to Britain's eastern-most city to gauge how the electorate will be casting its votes.