Detective Chief Inspector Craig Robinson, of South Yorkshire Police, has confirmed that missing teen Lorna Vickerage has been found in London and John Bush has been arrested on suspicion of child abduction.
DCI Robinson said officers had followed a trail from Watford to London today, adding that both Lorna and Bush are "safe and well" and Lorna's family had been informed.
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Police carried out a "proactive" operation after receiving reports that other concerts by the band had seen lots of mobile phone thefts.
The child died on her injuries and another 14-year-old girl was injured after the buggy they were travelling in was involved in a car crash.
Cloud thickening from the west throughout the day. Rain in northwest later.