An initial examination by the Irish Payment Services Organisation (IPSO) is showing no fraudulent activity on the credit cards of Supervalu and AXA customers.

It emerged that the card details of some 80,000 clients of getaway break schemes involving those companies were breached.

A third party company LoyaltyBuild was the victim of a sophisticated criminal attack, involving hundreds of thousands of credit card holders across Europe.

However IPSO says it has not found any evidence as yet that the cards have been scammed although it says its investigation is continuing.

The breach seems to have taken place in mid-October and affected customers should have been notified by now directly by Supervalu and Axa.

The IPSO says they should examine their card transactions since mid-October to identify any that they did not authorise.

But it adds that cardholders will not be liable for any fraud that has occurred as a result of this incident.

An investigation into the security breach is now being led by the garda fraud squad.

However Commissioner Martin Callinan says that is being made more difficult and complex by the international dimension.

Meanwhile another two Irish companies have fallen victim to the security breach suffered by Supervalu and Axa customers.

The names of the companies have not been released but it is understood that both operate a LoyalyBuild scheme.

There had been fears that hackers may have gained access to the details of nearly 500,000 European card users two years ago, in what is been described as the biggest and most sophisticated cyber criminal attack in Europe.

They have now been told by the Data Commissioner that they need only check their statements for the past month.

Billy Hawkes told Newstalk Breakfast earlier it should offer slight relief to those affected.