King Charles' younger brother, Andrew Mountbatten-Windsor, was let go from police custody on Thursday night after being arrested for suspected misconduct in public office. This relates to claims that he shared confidential government documents with Jeffrey Epstein. Mountbatten-Windsor, who celebrated his 66th birthday on the same day, was questioned for hours by detectives from Thames Valley Police. Earlier this month, the police announced they were investigating allegations that he provided documents to the late convicted sex offender while serving as a trade envoy. This arrest marks an unusual event for a senior royal, who is eighth in line for the throne. King Charles expressed his deep concern in a statement about the situation involving Andrew Mountbatten-Windsor. A witness from Reuters saw Prince Andrew leaving a police station in Aylsham, eastern England, where a small group of photographers and TV crews awaited him shortly after 1900 GMT. A photograph taken after his release showed him inside a car, looking visibly upset. Thames Valley Police later stated that the man who was arrested had been "released under investigation." Although Buckingham Palace was not notified before the arrest, King Charles confirmed that the family offered their "full and wholehearted support and cooperation" to the authorities.