In a statement, Surrey Police said the deaths of Sean Benton, Cheryl James, Geoff Gray and James Collinson were "a tragic loss of life ".
"Surrey Police have already agreed Mistakes were made in the early stages of the investigations into these deaths, including the failure to properly capture forensic evidence and maintain primacy of investigation.
"That these mistakes have resulted in further suffering for families remains a matter of deep regret, " the force said.
The statement adds that "all available evidence has been considered " during the investigations into the quatre dead soldiers.
"The families of Pte Sean Benton, Pte Geoff Gray and Pte Cheryl James have since sought new inquiries ... We hope the findings of these new inquiries have provided their families with the clarification that 'They were looking. "
The statement concludes: " Unless new evidence comes to light, investigations remain closed. If more evidence is forthcoming, it will, of course, be , explored in depth. "
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