The Old Bailey has been told that the men deliberately targeted vulnerable young girls, often those living in care and with troubled and unsettled lives.
They found girls who were "out of control" and may already have been sexually abused.
They would frequently approach the girls while they were playing truant from school or out having an illicit drink. The men groomed the girls by offering them alcohol, or sometimes by simply offering the kind of attention they craved and that was missing from their lives.
They would hook the girls in by plying them with drink and often gave the girls drugs, including cannabis, crack and sometimes heroin, which they then became addicted to.
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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.