Speaking to Sky News, the sister of Meredith Kercher, Stephanie, welcomed today's decision. She said there were "questions still unanswered", and it was "a step towards finding out the truth".
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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.