A police spokesman said Sam Woodhead was a little sunburned when he was found, but was hydrated and otherwise well. His family has been notified.
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The 34-year-old from Coulsdon in Surrey died during the private party in Headley in the early hours of Monday, Surrey Police said.
The Home Office made the arrests at various restaurants across London on July 4.
Two years on from the Israel-Hamas conflict, Hamas cadets are being trained to carry out raids in a terrifying summer camp.