Mountbatten-Windsor, who turned 66 on Thursday, was arrested and questioned by detectives from Thames Valley Police, News.az reports.
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Earlier this month, the police force said it was looking into allegations that he had passed documents to the late convicted sex offender while working as a trade envoy.
The arrest of the senior royal, eighth in line to the throne, is unprecedented in modern times.
“I have learned with the deepest concern the news about Andrew Mountbatten-Windsor and suspicion of misconduct in public office,” King Charles said in a statement.
