The fact a terrorist attack on New Zealand remains a future possibility is coming as no surprise to one security expert.

A Security Intelligence Service report states we're facing one of the most challenging national security environments in recent times.  

It's kept our terrorism threat at low, indicating an attack is realistically possible. 

Massey University's John Battersby told Ryan Bridge he's often been critical of Kiwis' complacency.  

He says all of the things listed in this threat assessment have existed for quite some time. 

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