Spanish prosecutors opened an investigation into the use by Juan Carlos and other members of the royal family of credit cards used between 2016 and 2018 which were paid for by an overseas account to which neither Juan Carlos nor any member of the royal family were signatories, leading to accusations that the funds are undisclosed assets of Juan Carlos, and as the card drawings exceeded €120,000 in one year, comprised undisclosed income and was therefore a tax offence in Spain. Mexican millionaire and investment banker Allen Sanginés-Krause has been named as the owner of the cards, a friend of Juan Carlos to whom he donated sums of money using Air Force Colonel Nicolás Murga Mendoza as an intermediary.