A Ministry of Defence spokeswoman said: "Our thoughts remain with the family and friends of Private Cheryl James.
"This decision is a matter for the Attorney General and the courts. "If a new inquest is ordered, we will of course provide support to the coroner when needed."
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The band announced at a free concert on Friday that they would take over the event's Pyramid stage on Saturday June 25.
The victims were collecting permits and escorts a day after their home town was liberated from the extremists.
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.