Police investigating the disappearance of twin 16-year-old girls who are feared to have fled their home in Manchester to travel to Syria to join Islamist militants from Isis are looking into who funded the trip.
Good Morning Britain Chief Correspondent Richard Gaisford reports that the girls may have travelled there to become "Jihadi brides".
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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.