West Yorkshire Police said that it was, "incredibly frustrating that this has turned out to be a hoax...We treated the call as genuine on the basis of what she said."
More top news
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.