An email from 2010 suggests that Andrew Mountbatten-Windsor, then a prince, may have shared reports of business visits to Vietnam, Singapore, Hong Kong and Shenzhen, China, with Epstein after an official visit to Asia.
The BBC reports he allegedly also sent details of the trip, where he was accompanied by Epstein's business partners, and information about investment opportunities. Trade envoys are bound by confidentiality when it comes to sensitive, commercial or political information related to official visits.
British police are investigating the information, and the royal family says it - with King Charles at the helm - is ready to help the police if necessary.
"The King has been clear that he is deeply concerned by the allegations regarding Mr Andrew Mountbatten-Windsor's conduct that continue to emerge," a statement from Buckingham Palace said.
The former prince is one of many celebrities who have found themselves in the crosshairs of the Epstein investigation. Mountbatten-Windsor lost his title of prince in October last year.
Corrected: In a previous version, Andrew Mountbatten-Windsor was given an incorrect title.
