Meanwhile, the disruptions have been resolved and the banks' sites are accessible again. It is not known why the attacks are specifically aimed at these banks. In a DDoS attack, the server is overloaded from the outside so that it goes offline. A spokesperson for ABN AMRO announced that customer data has never been at risk as this was not a hack.

ABN AMRO experienced a number of DDoS attacks over the weekend of January 27. Read the full message below. pic.twitter.com/fLK2jpZK9u

— ABN AMRO (@ABNAMRO) January 28, 2018

DDoS attacks 'a daily occurrence'

Although the attacks this weekend seem unique, Klaas Knot, president of De Nederlandsche Bank (DNB), stated in the program Buitenhof that this is far from the case. 'That is the reality in 2018,' Knot said.

The attacks come at a time when the Netherlands is in the spotlight after it became known that hackers from the AIVD were watching how the Russian hacker group Cozy Bear interfered in the American presidential elections. It is not known whether the DDoS attacks this weekend are related to this.

According to ABN AMRO, the bank meets the availability standards. Additionally, both ABN AMRO and ING maintain their own page regarding the availability of the services they provide. ABN AMRO's can be found here, and ING's can be found here.