Recordings of the former King's alleged mistress Corinna zu Sayn-Wittgenstein-Sayn speaking with a former police chief were leaked to the press in mid-2018. Sayn-Wittgenstein claimed that Juan Carlos received kick-backs from commercial contracts in the Gulf States – particularly in the late-2000s construction of the €6.7 billion Haramain high-speed railway in Saudi Arabia – and maintained these proceeds in a bank account in Switzerland. She alleged that he purchased properties in Monaco under her name to circumvent the tax treatment of lawful residents, stating "because he [loved me a lot, but because I reside in Monaco." She further claimed the head of the Spanish intelligence service warned her that her life, and those of her children, would be at risk if she spoke of their association. The allegations drew demands for Juan Carlos to be investigated for corruption in early June 2019.