Two Canadian men have been arrested after skimming devices were found on ATMs in Christchurch.

The mechanisms can record a customer's card details when the cards are put into the affected ATM.

The details are then used to steal money from the cards' accounts.

The men aged 28 and 39, have been charged with accessing a computer for a dishonest purpose and further charges are likely.

Detective Sergeant Joanne Parks says anyone noticing anything added to an ATM or anything unusual about an ATM should report it to the bank immediately.

They'll appear in court on Monday.