Clients of independent bank DSB were unable to transfer their money electronically on Thursday, leading the company to blame a concerted attack by hackers.
But the Telegraaf claims the site crashed because too many customers were trying to shift their money following a tv programme.
Pieter Lakeman, who leads a lobby group of DSB clients who believe they have been over-sold mortgages, said on tv show Goedemorgen Nederland that people should take their money out of the bank. By forcing its bankruptcy, they could then get compensation for their losses, he told the show.
The lobby group represents some 1,200 people and is currently preparing a legal claim against DSB.
But DSB spokesman Klaas Wilting said the site had been besieged by hackers. In addition, the site is undergoing maintenance, the Volkskrant reported.
Earlier this week, several former DSB staff told tv programme Nova that they had been encouraged to sell unnecessary policies to customers. And in May, DSB was fined by the financial services regulator AFM for extending mortgages which its clients could not properly afford.
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