Minister for Justice Heather Humphreys has said she is concerned that gardaí are continuing to cancel 999 calls without going through the proper procedure and in spite of the ongoing public controversy surrounding the issue.

The Garda Commissioner said 19,000 calls were being examined and so far two incidents of particular concern in relation to the misclassification of calls had been identified.

However, Drew Harris said it was too early to say if procedures were being frustrated, circumvented or the issue involved human error.

The Garda Commissioner and the Minister for Justice were at Garda Headquarters today to mark 25 years since the establishment of the Criminal Assets Bureau.

Minister Humphreys said she shared the concern of the Policing Authority in relation to the continued cancellation of 999 calls and the misclassification of others.

However, she said she wanted to reassure the public that when the call 999 they will get an appropriate policing response.

The Garda Commissioner said he was disappointed that they had discovered these issues but they were still trying to ascertain the extent and cause of the problem.

Not all the calls were 999 calls he said and 19,000 of them related to people calling the gardaí with information which they had categorised as "intelligence calls".

This category was introduced as part of the remedial measures when the problem first arose last November he said but gardaí did not expect so many calls to be classified in this category.

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They were now working through these calls he said and had, so far, found two incidents of particular concern.

He said they were disappointed and did not expect this issue to emerge and consequently informed the Policing Authority.

Drew Harris said gardaí deal with thousands of calls every day and there would be mistakes as a result of human error but he wanted to make sure people have confidence in the system.

He also said the ongoing Garda inquiry into the actions of some gardaí who cancelled 999 calls outside of new procedures introduced was continuing. There may be disciplinary action, he said, but at this stage it was still too early to say.

Commissioner Harris and Minister Humphreys were at Garda Headquarters to mark 25 years since the establishment of the Criminal Assets Bureau, one of the most successful weapons in the State's armoury against organised crime.

The head of the bureau, Detective Chief Superintendent Michael Gubbins, said it was important for their own protection that CAB officers maintain their anonymity.

At present he said CAB were targeting the assets and wealth of over 1,800 people, 35 of whom are living outside the State.

The bureau has denied and deprived criminals of almost €200 million since its establishment in 1996 following the murders of detective Garda Jerry Mc Cabe and the journalist Veronica Guerin.