Dutch parent banks of three lessors have been hit by cyber-attacks one after the other over the last 48 hours.

Servers at ABN Amro, ING and Rabobank have been subject to a DDoS, or Distributed Denial of Service attack, where a server connected to the internet is overflooded with data requests, and subsequently crashes.

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ABN Amro’s infrastructure was the first to be targeted. On Saturday, the bank’s home and mobile banking services became unavailable for a few hours. The bank subsequently restored functionality, but its servers were attacked twice more, with the last attack ending around noon on Sunday. ABN Amro said no customer data had been compromised.

ING subsequently said it was hit by a DDoS attack on Sunday night. Rabobank’s said on Monday morning that it was also being targeted. At the time of writing, it is unclear whether Rabobank has restored full functionality to its servers.

The iDEAL ecommerce payment platform, which all three banks participate in, also became disrupted during the attacks.

Dutch news website NOS reported on Monday that the Netherland’s tax authority was also targeted in the DDoS wave.

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A spokesman for Dutch central bank DNB told NOS: “Everything seemed to be in order since the big DDoS attack on ING in 2013. There is now clearly something we need to respond to, and we are discussing this with the banks.”

Speaking on Dutch TV on Sunday night, DNB president Klaas Knot said that such attacks were at the order of the day. “That’s the reality in 2018,” he said, adding that the DNB was liaising with banks over the issue of cyber-attacks.