Prime Minister John Key says every country in the world is vulnerable to a terrorist attack but New Zealand is probably less vulnerable than most others.
He also said that being a member of the Five Eyes Club - the intelligence alliance with the US, Britain, Canada and Australia - also gave New Zealand an advantage in terms of monitoring suspects but terrorists were getting more sophisticated.
Speaking to New Zealand reporters in Hanoi, he said he would not characterise the Paris terrorist attacks on Saturday at the weekend as a failure of intelligence.
"I wonder whether the right characterisation isn't that they failed but that the terrorists are becoming more sophisticated and quite a lot of the communications they have are what, in the business, we would call dark. In other words we can't actually monitor them."
Some of the media reports he had seen indicated there had been no conversations by the perpetrators that had been conducted on anything that remotely looked like an open line.