Police have cordoned off the road where a body was found in a well at a property in Surrey.
Scotland Yard confirmed that seven men had been arrested on suspicion of murder.
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Nabi Tajima, who was the last known person to have been born in the 19th century, died in Japan after being in hospital since January.
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Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.