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The 32-year-old offender reportedly landed himself on terror watchlists after twice buying hunting knives and being found to possess Islamic State propaganda videos, NZHerald reported.
Just last month, he was sentenced to a one year supervision order for possessing propaganda videos created by the Islamic State that promoted terrorism.
He had reportedly performed internet searches asking about the guidelines of 'lone-wolf mujahideen', knife attacks and prison conditions in New Zealand.
After receiving a formal warning from police, 'S' reportedly made a social media post which read: 'One day I will go back to my country and I will find Kiwi scums in my country… and I will show them… what will happen when you mess with S while I'm in their country. If you're tough in your country… we are tougher in our country scums.'
'S' had reportedly told worshipers in his mosque that he intended to join ISIS and was arrested at Auckland Airport in May 2017 after booking a one-way ticket to Singapore.
The outlet revealed he had only recently been released from prison after a High Court judge ruled preparing a terrorist attack was not equitable to performing a terrorist act and sentenced him on a lesser charge.
The day after he walked free from prison, 'S' purchased yet another hunting knife. He was arrested again, but was not prosecuted under the strict terrorism laws.
Ms Ardern reiterated several times on Friday afternoon that the Countdown attack was the work of 'an individual, not a faith'.
Disturbing footage of the attack was shared online, showing customers running to safety as at least 10 police units swarmed the surrounding streets.
'Holy f**k. Oh my God… Someone is in there with a knife, somebody has been stabbed,' a woman said in the footage
A witness said people were 'running out, hysterically, just screaming, yelling, scared' as an elderly man laid injured on the floor and a middle-aged woman was stabbed in the shoulder.
One bystander video taken from inside the supermarket records the sound of 10 shots being fired in rapid succession.
The offender was reportedly acting 'like a lunatic' and indiscriminately lunging at anybody in his path, the witness said.
Another woman said she heard police ordering the offender to surrender before five gunshots rang out.
Two officers were involved in shooting him dead.
The three victims who remain in a critical condition were rushed to Auckland City hospital along with a fourth person in a serious condition.
One victim in a stable condition was taken to Waitakere Hospital while another was rushed to Middlemore Hospital.