A 69-year-old British man has been found dead at a Spanish campsite at L'Estartit, a seaside town on north east Spain's Costa Brava.
Catalan police have said a 45-year-old man said to be his son has been arrested on suspicion of murder.
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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.