ASB customers nationwide were cut off from services due to "technical issues" for hours.
The bank’s ATMs, Eftpos cards, and internet banking services are all affected.
A spokesperson issued an apology to customers and thanked them for their patience: "We’re hoping to get full service restored as a matter of priority," she said.
However a Facebook post by the bank about 1am said "our systems and payments are back online again and we apologise for the disruption to everyone".
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Investigations have been hampered by the fact that the system failure has also affected the bank’s internal communications.
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