Under the Radar

The Christchurch massacre and the rise of right-wing extremism.

"Grafton is a monochrome, traditional, beautiful little country town. We now have... the distinction of having given the world a gentleman who's turned out to be Australia's worst mass murderer." Grafton resident.

The terror attack in the New Zealand city of Christchurch appalled the world. The indiscriminate shooting of 50 Muslim worshippers during Friday prayers was calculated to spread fear and a message of right-wing terror.

"My feeling is that he chose New Zealand because it was a soft target in terms of security and perhaps, he chose it to illustrate that even a relatively tolerant quiet society on the very edge of the world was not immune to terrorism." Far-right extremism researcher.

On Monday, Four Corners investigates how the Australian born accused killer was able to operate under the radar.

"They go to these forums where they can talk about this stuff safely. No-one knows who they are... They can talk about that far right violent extremism there, where they can talk about hating and, and killing." Former right-wing extremist.

The plot was intricately planned, harnessing the tools and the power of the internet, to amplify the terror to a global audience.

"He's made it clear by his own recording that he was driven by hatred of Muslims and by racist ideas, and he identifies as a white supremacist, although he may not be able to spell those words, but they're the kind of cultural values that he's tied himself." Grafton resident.

The attack brought to light the violent and disturbing right-wing extremist movement that is flourishing on the internet and finding a home in both New Zealand and Australia.

"I guess people don't realise, there's all these far-right groups out there." Former right-wing extremist.

The program investigates whether authorities have been so focused on Islamic extremism that they've failed to grasp another deadly threat, the rise of far-right white supremacists.

"I'm aware that intelligence agencies have been monitoring these groups, but my concern is that what they've done is that they've tended to focus on Islamic terrorism at the expense of really paying enough attention to the extreme right." Extremist researcher.

Under the radar, reported by Sean Rubinsztein-Dunlop.