Two eagle-eyed SkyCity security guards have been credited with helping foil an alleged ATM card-skimming operation in Auckland.

The Police Financial Crime Unit told staff at the casino a week ago to be on the lookout for the Canadian man and woman.

Two guards noticed the pair and raised the alarm with police, who arrested them on Wednesday night.

The pair had allegedly obtained close to $200,000 from the skimming operation and had made attempts to obtain around $160,000 more, Auckland City Police said.

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The two foreign nationals were now facing a number of forgery-related charges and would be appearing in Auckland District Court.