Shares in ABN Amro, the Dutch bank, plunged as much as 10% on Thursday morning, after it disclosed it is facing an official investigation over money-laundering.

In a statement, the bank said: “The Dutch public prosecutor informed ABN Amro that the bank is the subject of an investigation relating to requirements under the act on the prevention of money laundering and financing of terrorism. ABN Amro will cooperate fully with the investigation.”